Here is a list of what was fixed since 11.5.4:

• 2022-01-11 45452ea700 [RELEASE] Release of TYPO3 11.5.5 (thanks to Oliver Hader)
• 2022-01-10 ef4f9a6d5b [BUGFIX] Correctly apply config.absRefPrefix to _assets resources (thanks to Oliver Hader)
• 2022-01-10 69a5ab4baa [BUGFIX] Enforce functional colors package (thanks to Andreas Fernandez)
• 2022-01-10 3cc1c16945 [BUGFIX] Restore sort link in FileList (thanks to Oliver Bartsch)
• 2022-01-10 b3d184863b [TASK] Update CKEditor to v4.17.1 (thanks to Oliver Hader)
• 2022-01-10 3e6e92bd53 [TASK] Unify TSFE usage consistently in HMENU (thanks to Benni Mack)
• 2022-01-10 e0783961c9 [TASK] Update @claviska/jquery-minicolors to v2.3.6 (thanks to Oliver Hader)
• 2022-01-10 0f50cf35f0 [BUGFIX] Exclude pages from linkvalidator path (thanks to Oliver Bartsch)
• 2022-01-10 021bc8d9a5 [BUGFIX] Fix rootlevel check in ListModule fieldControl (thanks to Oliver Bartsch)
• 2022-01-10 43944c344a [BUGFIX] Use typolink in EmailViewHelper (thanks to Benni Mack)
• 2022-01-10 9f56263272 [TASK] Clean up Page Link Builder code (thanks to Benni Mack)
• 2022-01-08 33b6e0a983 [TASK] Switch description of partialRootPaths and layoutRootPaths (thanks to Stefan Frömken)
• 2022-01-07 36edcee36d [TASK] Extract inline mn attribute scenario from ext:irre_tutorial (thanks to Anja Leichsenring)
• 2022-01-07 56ac7aa8c4 [BUGFIX] Fix sprintf() PHP warning in FinisherOptionGenerator (thanks to Benjamin Franzke)
• 2022-01-07 aeba438a03 [BUGFIX] Prevent redirects causing infinite redirect loops (thanks to Jörn Wagner)
• 2022-01-07 8bfa7b9fdb [BUGFIX] Prevent undefined array key in PageLinkHandler (thanks to Oliver Bartsch)
• 2022-01-07 d673b7f679 [TASK] Use ORDER BY uid DESC in LiveSearch (thanks to Stefan Froemken)
• 2022-01-07 6bda1ea5e0 [BUGFIX] TypoLink is executed fully without href attribute (thanks to Benni Mack)
• 2022-01-07 8819a39e72 [TASK] Ensure ATagParams are overridden from global option (thanks to Benni Mack)
• 2022-01-06 d8e25e2ca2 [BUGFIX] Ensure config.spamProtectEmailAddresses = ascii works for external URLs (thanks to Benni Mack)
• 2022-01-06 83daec59c0 [BUGFIX] Mark broken links to hidden page and CEs (thanks to Sybille Peters)
• 2022-01-06 095b636f39 [BUGFIX] Use typolink consistently for makelinks functionality (thanks to Benni Mack)
• 2022-01-06 12fdd9e488 [BUGFIX] Check for excludeUidList in HMENU of default language (thanks to Benni Mack)
• 2022-01-06 7f6fd46c2f [TASK] Extract simple mn attribute scenario from ext:irre_tutorial (thanks to Anja Leichsenring)
• 2022-01-06 c817e35c81 [BUGFIX] Ensure correct test expectation for hierarchicalMenuIsGenerated (thanks to Stefan Bürk)
• 2022-01-06 1072b2a39e [TASK] Ensure that hidden pages are not rendered as subpages in HMENU (thanks to Benni Mack)
• 2022-01-05 15c5d3394d [BUGFIX] Use "pages.target" properly for Pages with External URL (thanks to Benni Mack)
• 2022-01-05 69f540a8c6 [BUGFIX] Change misleading label for workspace mass action (thanks to Oliver Bartsch)
• 2022-01-05 dc2c9dbde3 [BUGFIX] Provide quoted array to string-list implode support (thanks to Stefan Bürk)
• 2022-01-05 b2b124cbf9 [TASK] Better performance for LiveSearch (thanks to Stefan Froemken)
• 2022-01-05 468b1f6aa0 [TASK] Make status of simulate time clearer (thanks to Susanne Moog)
• 2022-01-05 cdb016b37c [TASK] Adjust QueryBuilder PHPDoc comments (thanks to Ingo Fabbri)
• 2022-01-05 a6593bd949 [BUGFIX] Mark shortcut pages as active in HMENU (thanks to Benni Mack)
• 2022-01-05 8b3e6321e2 [BUGFIX] Resolving page slug ending with index and type suffix '.php' (thanks to Stefan Bürk)
• 2022-01-05 dd291132d7 [BUGFIX] Add TCA migration for select authMode keywords (thanks to Nikita Hovratov)
• 2022-01-05 10fff85596 [BUGFIX] Add CompositeExpression argument docblock type-hint (thanks to Ingo Fabbri)
• 2022-01-04 0800ba7c2c [BUGFIX] Rename variable for storing the translated options (thanks to Jan Helke)
• 2022-01-04 7b8fa8975d [TASK] Extract symmetric mn scenario from ext:irre_tutorial (thanks to Anja Leichsenring)
• 2022-01-04 a73326824f [BUGFIX] Fix ordering of db mounts in page tree (thanks to Benjamin Franzke)
• 2022-01-04 44a34cd874 [BUGFIX] Do not overwrite previously set preview mode (thanks to Susanne Moog)
• 2022-01-04 c7c55a7cbe [BUGFIX] Avoid invalid mktemp argument busybox in cglGit (thanks to Christian Kuhn)
• 2022-01-04 0beca1c6d3 [BUGFIX] Set mute=1 if autoplay=1 for rendering youtube videos (thanks to Georg Ringer)
• 2022-01-04 dc00f26cf8 [BUGFIX] Check correctly for TCA search options (thanks to Nikita Hovratov)
• 2022-01-04 8ddf6b84ca [BUGFIX] Fix undefined array key error in DatabaseRecordList (thanks to Nikita Hovratov)
• 2022-01-03 445f60667d [TASK] Update symfony dependencies to 5.4 (LTS) (thanks to Benni Mack)
• 2022-01-03 444438b60b [BUGFIX] Avoid undefined array key in inlineLocalizeSynchronize function of DataHandler (thanks to Johannes Seipelt)
• 2022-01-03 2a9dcee921 [TASK] Add allowed composer plugins for composer >= 2.2.0 (thanks to Torben Hansen)
• 2022-01-03 14451baa8a [BUGFIX] Use realpath() for vcsIgnore in CGL fixer (thanks to Christian Kuhn)
• 2022-01-03 0763821340 [BUGFIX] Allow rendering of subpages for spacers (thanks to Benni Mack)
• 2022-01-03 0ce2504310 [BUGFIX] Avoid array offset on null warning when generating preview URL params (thanks to Chris Müller)
• 2022-01-03 52d4e53701 [BUGFIX] Avoid type errors in TimeTracker (thanks to Susanne Moog)
• 2021-12-30 cd6df0df2b [BUGFIX] Avoid undefined array key in LegacyLinkNotationConverter (thanks to Chris Müller)
• 2021-12-30 62ada6fad9 [BUGFIX] Avoid duplicate pages in pagetree when rootPid is mounted (thanks to Benjamin Franzke)
• 2021-12-30 75c21c6bbc [BUGFIX] Fix TCA of sys_workspace custom_stages (thanks to Nikita Hovratov)
• 2021-12-30 a656190499 [BUGFIX] Avoid undefined array key in garbage collection task (thanks to Chris Müller)
• 2021-12-29 f931a62ab1 [TASK] Fix typo in InputDateTimeElement (thanks to Nikita Hovratov)
• 2021-12-28 364541474e [BUGFIX] Remove useless felogin view configuration (thanks to Markus Klein)
• 2021-12-23 4d980f4edb [TASK] Add tests for list menu with folder as root storage (thanks to Benni Mack)
• 2021-12-23 dc749a1567 [BUGFIX] Do not link to untranslated records (thanks to Mathias Brodala)
• 2021-12-23 1d5d5743e4 [BUGFIX] Be consistent in HMENU.special = language (thanks to Benni Mack)
• 2021-12-23 c634d40405 [BUGFIX] Avoid PHP 8 warnings in LocalCropScaleMaskHelper (thanks to Benni Mack)
• 2021-12-23 f99cd918a2 [BUGFIX] Fix PHP 8 notices in workspaces preview (thanks to Benni Mack)
• 2021-12-23 18b658822a [BUGFIX] Resolve shortcuts in HMENU to access restricted pages (thanks to Benni Mack)
• 2021-12-23 90817ca999 [BUGFIX] Avoid undefined array key in ContentObjectRenderer->getTypoLink() (thanks to Chris Müller)
• 2021-12-23 f6d94968a6 [BUGFIX] Avoid undefined array key in TextMenuContentObject->writeMenu() (thanks to Chris Müller)
• 2021-12-23 061c799d6b [BUGFIX] Respect query settings for version overlay enable fields (thanks to Sebastian Michaelsen)
• 2021-12-23 e1c5366c1b [BUGFIX] Properly support translations only page module (thanks to Oliver Bartsch)
• 2021-12-21 3a8959685a [BUGFIX] Initialise parameter in AbstractElementBrowser correctly (thanks to Chris Müller)
• 2021-12-21 f425ae37f7 [BUGFIX] Ignore unmapped tables on non-default connections (thanks to Stephan Großberndt)
• 2021-12-21 61af3e74e3 [BUGFIX] Avoid undefined array key warnings in DatabaseRecordLinkBuilder (thanks to Chris Müller)
• 2021-12-21 308e07f197 [BUGFIX] Avoid PHP8 warning for "Insert records" with hidden records (thanks to Chris Müller)
• 2021-12-21 ed0912e0a7 [BUGFIX] Use generated TSFE in PageLinkBuilder (thanks to Andreas Fernandez)
• 2021-12-21 a8b9eefb2d [TASK] Allow EXT: syntax in f:uri.resource VH (thanks to Christian Kuhn)
• 2021-12-21 f1b4f90e8a [BUGFIX] Allow CSV in startingPoints config as advertised (thanks to Andreas Fernandez)
• 2021-12-21 92072aa10e [TASK] Remove stray javascript build outputs (thanks to Benjamin Franzke)
• 2021-12-21 3344f50063 [BUGFIX] Fix doctype annotations (thanks to Simon Schaufelberger)
• 2021-12-21 ad3856650d [BUGFIX] Resolve shortcuts in typolink directly (thanks to Benni Mack)
• 2021-12-21 e9b4375471 [TASK] Switch to new REST API end point (thanks to Simon Gilli)
• 2021-12-21 79a5e13bb3 [TASK] Raise friendsofphp/php-cs-fixer:^3.4 (thanks to Benni Mack)
• 2021-12-21 9faf357aa7 [BUGFIX] Remove useless string cast of idn_to_ascii() (thanks to Andreas Fernandez)
• 2021-12-20 ed725d1273 [BUGFIX] Forward-compatible prepared statement support (thanks to Stefan Bürk)
• 2021-12-20 21798082f6 [BUGFIX] Fix scoping issue in FormEngineValidation (thanks to Benjamin Franzke)
• 2021-12-20 b20ef47f29 [TASK] Avoid deprecated doctrine/dbal method 'executeUpdate()' (thanks to Stefan Bürk)
• 2021-12-20 fd8d65c54e [BUGFIX] Fix extension path in ComposerDeficitDetector (thanks to Helmut Hummel)
• 2021-12-19 783abed04b [BUGFIX] Avoid exception in ContentObjectRenderer with PHP8 (thanks to Torben Hansen)
• 2021-12-18 9f4edc9f51 [BUGFIX] Fix PHP 8 strict warning in Package MetaData (thanks to Helmut Hummel)
• 2021-12-17 99d92d22fe [BUGFIX] Make RichTextElement PHP 8 compatible (thanks to Markus Klein)
• 2021-12-17 0a2730c794 [BUGFIX] Pass sanitized additional where as string in DatabaseRecordList (thanks to Oliver Bartsch)
• 2021-12-17 cfa17a741a [BUGFIX] Avoid select and therefore fetchFirstColumn() of doctrine/dbal (thanks to Helmut Hummel)
• 2021-12-17 bf3eaa6c47 [BUGFIX] Fix validation in form override settings (thanks to Nikita Hovratov)
• 2021-12-16 b10cddb65e [BUGFIX] Ensure getTreeList() keeps ordering of subpages (thanks to Benni Mack)
• 2021-12-16 0c04d918cc [BUGFIX] Do not render hidden pages in HMENU list (thanks to Benni Mack)
• 2021-12-16 9fbda17396 [BUGFIX] Handle missing $_SERVER['PATH_INFO'] (thanks to Markus Klein)
• 2021-12-16 20d8dd778a [BUGFIX] Avoid duplicate results in HMENU with workspaces (thanks to Benni Mack)
• 2021-12-16 873f677766 [TASK] Avoid extending view helpers in ext:extensionmanager (thanks to Christian Kuhn)
• 2021-12-15 0d4f8ac3af [BUGFIX] Missing rootline in BE ConditionMatcher if page id is determined (thanks to Marc Bastian Heinrichs)
• 2021-12-15 6841ca1b20 [BUGFIX] Remove workspace info from logging module if not needed (thanks to Georg Ringer)
• 2021-12-15 f6981e7cd4 [BUGFIX] Consider Context API when using f:format.date (thanks to Benni Mack)
• 2021-12-15 537e227ac4 [BUGFIX] Always return a string for PHP 8.1 (thanks to Chris Müller)
• 2021-12-15 58f03b18c0 [BUGFIX] Load all backend routes in installer controller (thanks to Simon Gilli)
• 2021-12-15 c3a1c2380f [BUGFIX] Fix undefined key warning in EXT:core/TimeTracker with PHP8 (thanks to Florian Rival)
• 2021-12-15 fa7a86563f [BUGFIX] Render hreflang only for translated pages (thanks to Guido Schmechel)
• 2021-12-15 9485dcad0b [DOCS] Resolve warnings in EXT:form manual (thanks to linawolf)
• 2021-12-14 0dbce15e59 [BUGFIX] Pass default/override values to FormSelectTreeAjaxController (thanks to Oliver Bartsch)
• 2021-12-14 19290a6a61 [DOCS] Resolve warnings in System extensions manuals (thanks to linawolf)
• 2021-12-14 ad34bbb436 [TASK] Set TYPO3 version to 11.5.5-dev (thanks to Benni Mack)