Here is a list of what was fixed since 11.5.30:

• 2023-09-12 b0449fa34d [RELEASE] Release of TYPO3 11.5.31 (thanks to Benni Mack)
• 2023-09-10 16f6dadd5e [BUGFIX] Fix deprecation rule in cs fixer tests (thanks to Oliver Wand)
• 2023-09-09 e21bb8bb09 [TASK] Fix runTests.sh -u (thanks to Benjamin Franzke)
• 2023-09-08 49ab70c120 [BUGFIX] Localize children of all languages element (thanks to André Buchmann)
• 2023-09-08 f277d01bfb [BUGFIX] Respect crop of FileReference objects in getImgResource (thanks to Friedemann Altrock)
• 2023-09-08 739664fa02 [BUGFIX] Do not try to create symlinks on Windows (thanks to Helmut Hummel)
• 2023-09-08 501b4f1e23 [BUGFIX] Ensure online media without author works (thanks to Benni Mack)
• 2023-09-08 288d84b317 [TASK] Simplify filesystem usage in PackageArtifactBuilder (thanks to Helmut Hummel)
• 2023-09-07 8a16e93cb8 [BUGFIX] Stabilize AbstractDomainObject _isDirty check (thanks to Nikita Hovratov)
• 2023-09-07 d50216f5b2 [BUGFIX] Fix race condition in module router (thanks to Benjamin Franzke)
• 2023-09-07 bf720ff277 [BUGFIX] Fix notice in DataHandler if deleting a record (thanks to Georg Ringer)
• 2023-09-07 ee1461ea79 [BUGFIX] Hide form validators label when no one is available (thanks to Benjamin Franzke)
• 2023-09-06 bd308ebc65 [TASK] Add tests to show working regexp redirects with query parameter (thanks to Stefan Bürk)
• 2023-09-06 61d4c55757 [BUGFIX] Avoid native PHP warnings in FrontendBackendUserAuthentication (thanks to Stefan Bürk)
• 2023-09-05 9f5b375fcb [BUGFIX] Add missing label to modal close button (thanks to Benjamin Kott)
• 2023-09-05 59a3bc25db [DOCS] Use "Bootstrap" instead of "Twitter Bootstrap" in EXT:form documentation (thanks to Chris Müller)
• 2023-09-03 ba36b8932f [TASK] Add language attribute to *.action viewhelpers (thanks to Markus Klein)
• 2023-09-01 f2f79d955f [BUGFIX] Fix fluid template paths to respect TypoScript order (thanks to Friedemann Altrock)
• 2023-09-01 64859ceaf4 [BUGFIX] Reset RteHtmlParser properly when configuration changes (thanks to Friedemann Altrock)
• 2023-08-31 de80a95b7c [BUGFIX] Ensure correct record type for new record in SuggestWizard (thanks to Stefan Bürk)
• 2023-08-31 da471b0e88 [BUGFIX] Avoid strtotime(null) in BU::getProcessedValue() (thanks to Achim Fritz)
• 2023-08-30 c9873d5ea8 [BUGFIX] Fix several undefined array key issues in DataHandler scope (thanks to Oliver Hader)
• 2023-08-30 3e884ce612 [BUGFIX] Generate correct asset symlinks on Windows (thanks to Robert Kärner)
• 2023-08-29 ed57ed318a [BUGFIX] Avoid console error when tabbing through EXT:form inspector (thanks to Benjamin Franzke)
• 2023-08-28 b525531d2c [BUGFIX] Do not try to parse null/empty flexforms in ReferenceIndex (thanks to Oliver Klee)
• 2023-08-28 02f544597d [TASK] Update PHPStan & friends (thanks to Oliver Klee)
• 2023-08-23 d469b54922 [BUGFIX] Swap title and message of notification when creating a backend user (thanks to Andreas Fernandez)
• 2023-08-23 396296c307 [BUGFIX] EXT:indexed_search: Use correct API to calculate icon path (thanks to Andreas Fernandez)
• 2023-08-23 e487eb43b6 [BUGFIX] Allow comma and semicolon in TelephoneLinkHandler (thanks to Dominic Petit)
• 2023-08-23 c813459fd7 [DOCS] Fix formatting for lists in .rst (thanks to Sybille Peters)
• 2023-08-22 3b4e6f5819 [BUGFIX] Allow utf8mb3 as well for CharsetToCheck (thanks to Timo Gurr)
• 2023-08-18 393ad519de [BUGFIX] Upgrade to typo3/html-sanitizer v2.1.3 (thanks to Simon Gilli)
• 2023-08-16 9f68573ccb [TASK] Do not use to-be deprecated unload event (thanks to Andreas Fernandez)
• 2023-08-15 ea6e19a5b3 [BUGFIX] Fix Undefined array key warning in InlineRecordContainer (thanks to Thomas Hohn)
• 2023-08-14 9b61b3973b [BUGFIX] Fix undefined array key "pages" in FileContentParser (thanks to Thomas Hohn)
• 2023-08-09 ab90a35e6d [TASK] Fix PHP 8 compatibility in DataHandler (thanks to Ernesto Baschny)
• 2023-08-08 47722849ee [TASK] Fix example in urlencode ViewHelper (thanks to Stephan Bauer)
• 2023-08-08 462b32bd42 [TASK] Introspect acceptance testing (thanks to Benjamin Franzke)
• 2023-08-08 34069e2476 [TASK] Allow Piwik PRO debug mode param '_stg_debug' (thanks to Daniel Hettler)
• 2023-08-07 26788e3063 [BUGFIX] Fix PHP 8 warnings in DataHandler (thanks to Thomas Hohn)
• 2023-08-07 9519b1fb70 [TASK] Simplify runTests.sh DBMS version selection (thanks to Christian Kuhn)
• 2023-08-07 b205d6ebae [BUGFIX] PHP 8 warning in ContentObjectRenderer::editIcons (thanks to Thomas Hohn)
• 2023-08-06 d5d30fb52c [DOCS] Document known issues with ext:linkvalidator (thanks to Rémy DANIEL)
• 2023-08-05 879ef42aaa [BUGFIX] Don't notify the editor about canceled SvgTree Ajax request (thanks to Rémy DANIEL)
• 2023-08-05 53b0b81916 [BUGFIX] Avoid undefined array key access in DataHandler (thanks to Gordon Brüggemann)
• 2023-08-04 d01a03b032 [DOCS] Correct Changelog for ExtensionUtility::configurePlugin (thanks to linawolf)
• 2023-08-04 7679a2ed16 [TASK] Raise pre-merge acceptance test to PHP 8.3 (thanks to Anja Leichsenring)
• 2023-08-04 33e6d9496c [TASK] Run PHP8.3 functional tests (thanks to Stefan Bürk)
• 2023-08-04 d1fc31f969 [BUGFIX] Properly set memcache/memcached in cache backend (thanks to Christian Spoo)
• 2023-08-04 ad9b5077ad [BUGFIX] Remove GU::fixPermissionsSetsGroup() test (thanks to Tobias Liebig)
• 2023-08-03 fbbf43bf32 [BUGFIX] Display preview image of media resource (thanks to Simon Schaufelberger)
• 2023-08-03 d5ada85fd3 [TASK] Update typo3/testing-framework (thanks to Stefan Bürk)
• 2023-07-31 bb6a980cf9 [TASK] Avoid reports.xml in acceptance tests (thanks to Christian Kuhn)
• 2023-07-31 1d5985b43a [BUGFIX] Ensure string in htmlspecialchars() (thanks to Christian Kuhn)
• 2023-07-31 b4b6eff69d [BUGFIX] Fix return type of GU::getMaxUploadFileSize (thanks to Oliver Klee)
• 2023-07-31 37ea5a51d4 [BUGFIX] Fix label generation for inline files (thanks to Nikita Hovratov)
• 2023-07-30 dccecc5b75 [TASK] Stabilize PageTree related ac tests (thanks to Christian Kuhn)
• 2023-07-30 724e5f849f [TASK] Stabilize more Frontend/ ac tests (thanks to Christian Kuhn)
• 2023-07-30 6e99b1864a [TASK] Stabilize ac test Frontend\IndexedSearchCest (thanks to Christian Kuhn)
• 2023-07-30 e0845981cf [BUGFIX] Force correct type in FormViewHelper (thanks to Torben Hansen)
• 2023-07-30 96695f1d08 [TASK] Stabilize FileClipboardCest (again) (thanks to Christian Kuhn)
• 2023-07-29 c45d6d5bb1 [BUGFIX] Fix invalid null coalescing fallback to boolean in record list (thanks to Benjamin Franzke)
• 2023-07-29 33b86fe6b9 [TASK] Use ignore-platform-req workaround for phpspec/prophecy (thanks to Stefan Bürk)
• 2023-07-29 dd95f204fd [TASK] Fix mariadb acceptance test error detection (thanks to Benjamin Franzke)
• 2023-07-28 ac6a686c4b [TASK] Run unit tests with PHP 8.3 (thanks to Stefan Bürk)
• 2023-07-28 f488409d32 [DOCS] Add changelog for feature flag "allowInsecureSiteResolutionByQueryParameters" (thanks to Chris Müller)
• 2023-07-28 3eca33acc7 [TASK] Prepare runTests.sh to flexible container bin (thanks to Christian Kuhn)
• 2023-07-28 1f896b1222 [BUGFIX] Avoid undefined array key access in StaticRouteResolver (thanks to Stefan Bürk)
• 2023-07-27 a40d92a942 [TASK] Remove unexplained reference to Wordpress documentation (thanks to Chris Müller)
• 2023-07-26 94ed3abf2d [BUGFIX] Check array key existence in TSFE (thanks to Markus Klein)
• 2023-07-25 b651f126fc [BUGFIX] Apply proper url encoding to query params in form engine popups (thanks to Benjamin Franzke)
• 2023-07-25 3999784bda [TASK] Replace docker-compose in runTests.sh (thanks to Jochen Roth)
• 2023-07-25 21324f20a9 [TASK] Improve return type annotations for GU::trimExplode (thanks to Oliver Klee)
• 2023-07-25 9a03bcdf42 [BUGFIX] Check if '_ORIG_uid' really exists in ElementInformationController (thanks to Nikita Hovratov)
• 2023-07-25 792ac88185 [TASK] Set TYPO3 version to 11.5.31-dev (thanks to Oliver Hader)