Core change for T286694: Drop legacy cruft arising from introduction of ResultWrapper broke at least Semantic MediaWiki. Page Forms was affected too, but it may be fixed already (need confirmation).
SemanticeMediawiki
- Use of AbstractContent::getParserOutput
[2022-06-05T03:16:46.929718+00:00] error.WARNING: [72f2cc7209ab683e41d66757] /wiki/smw/schema:Group:Predefined_properties PHP Deprecated: Use of AbstractContent::getParserOutput was deprecated in MediaWiki 1.38. [Called from ContentHandler::callDeprecatedContentGPO]
- SMW\MediaWiki\Content\SchemaContent overrides fillParserOutput
[2022-06-05T03:16:46.929328+00:00] error.WARNING: [72f2cc7209ab683e41d66757] /wiki/smw/schema:Group:Predefined_properties PHP Deprecated: SMW\MediaWiki\Content\SchemaContent overrides fillParserOutput which was deprecated in MediaWiki 1.38. [Called from MediaWiki\Content\Renderer\ContentRenderer::getParserOutput]