Issue #3351458 by dburiak, Mingsong, Mahima_Mathur23, sthomen, smustgrave, catch, alexpott: [regression] Language switcher block returns links to node on the frontpage

Issue #3392200 by jeremy_p, joachim, hdnag, yepa: Invalid placeholder error message should say what's wrong with it

Issue #3402604 by alexpott, larowlan, catch, Spokje: SettingsTrayBlockFormTest::testBlocks() fails locally 100% of the time and lots of times on Gitlab CI

Issue #3356488 by BramDriesen, xjm, catch, fjgarlin, hestenet, longwave, larowlan, alexpott, lauriii: Mark Announcements Feed as stable

Issue #3390693 by mikelutz, smustgrave: MigrationPluginManager::ExpandPluginIds can lose derivative plugins under certain circumstances

Issue #3394741 by acbramley, jenlampton, smustgrave: BlockContentAccessControlHandler requires access block library permission for update, delete and revisions operations

Issue #3402548 by alexpott, mikelutz, el7cosmos: YamlFileLoaderTest fails if you have PECL yaml installed

Issue #3391786 by quietone, xjm, smustgrave: Fix spelling of words only misspelled in tests, variable names, part 5

Issue #3376843 by kristiaanvandeneynde, larowlan, catch, mxr576, quietone: Add the access policy API

Issue #3401971 by fjgarlin: Test-only job shouldn't require constant rebases to detect which files were changed

Issue #3402168 by Wim Leers, alexpott, Berdir, bircher, borisson_, effulgentsia: Follow-up for #3361534: Config validation errors can still occur for contrib modules, disrupting contrib

Issue #3400458 by alexpott, Berdir, longwave, ReINFaTe, mglaman, larowlan, Charlie ChX Negyesi, kristiaanvandeneynde, cmlara: AttributeClassDiscovery fails while trying to include non valid plugin class

Issue #3347721 by Wim Leers, dabley, lauriii, smustgrave, witeksocha, Reinmar, thatipudir: [Style] Warn the user about styles for unsupported elements

Issue #3401720 by neclimdul, acbramley: [random test fail] TimestampFormatterWithTimeDiffViewsTest::testTimestampFormatterWithTimeDiff

Issue #3401764 by BramDriesen, xjm, smustgrave: Replace CollegeHumor URLs and logic in core test cases

Issue #3175449 by mfb, super_romeo, smustgrave, _pratik_, Medha Kumari, Nitin shrivastava, quietone, alexpott, xjm, dagmar, longwave: Display backtrace for logged throwables on log message details page

Issue #3380239 by smustgrave, pradhumanjain2311, FlusteredLondon, xjm, joachim, cilefen: Date token descriptions are confusing

Revert "Issue #3383131 by WalkingDexter, xjm, allisonherodevs, ashley_herodev, pradhumanjain2311, smustgrave, marcoliver, lauriii: Entity autocomplete form element ignores entities with label "0""

This reverts commit 68dfec3c.

Issue #3316274 by Wim Leers, catch, nod_, alexpott, longwave, bnjmnm: Stabilize FunctionalJavascript testing AJAX: add ::assertExpectedAjaxRequest()

Issue #3401971 by fjgarlin: Test-only job shouldn't require constant rebases to detect which files were changed

Issue #3383131 by WalkingDexter, xjm, allisonherodevs, ashley_herodev, pradhumanjain2311, smustgrave, marcoliver, lauriii: Entity autocomplete form element ignores entities with label "0"

Issue #3398400 by pradhumanjain2311, joachim, smustgrave: Clean up repeated method calls in ValidReferenceConstraintValidator

Issue #2904899 by FeyP, idflood, smustgrave, alexpott: Invalid argument exception when changing language of node with menu link to und or zxx

Issue #3401236 by pradhumanjain2311, xjm, joachim, smustgrave: Rename EntityReferenceTestTrait to help discoverability

Issue #3400368 by Wim Leers, xjm, borisson_, catch: Deprecate path.temporary in system.file configuration schema

Issue #3377310 by catch, joelpittet, mark_fullmer, smustgrave, TrevorBradley, bkosborne, MWaters, cilefen, capellic: 400 exceptions result from requests for old asset paths which are missing the "theme" query string, possibly from cached pages