E.g. in this build (for this change):
There were 2 errors: 1) Wikibase\Search\Elastic\Tests\Fields\StatementQuantityFieldTest::testGetFieldData with data set "entity with statements but no qualifiers" (Wikibase\DataModel\Entity\Item Object (...), array()) TypeError: Argument 1 passed to MediaWikiIntegrationTestCase::{closure}() must be an instance of Wikibase\DataModel\Entity\EntityIdValue, instance of DataValues\UnDeserializableValue given, called in /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php on line 177 /workspace/src/extensions/Wikibase/repo/WikibaseRepo.datatypes.php:421 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php:177 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php:196 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php:238 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementQuantityField.php:77 /workspace/src/extensions/WikibaseCirrusSearch/tests/phpunit/Fields/StatementQuantityFieldTest.php:105 phpvfscomposer:///workspace/src/vendor/phpunit/phpunit/phpunit:106 2) Wikibase\Search\Elastic\Tests\Fields\StatementQuantityFieldTest::testGetFieldData with data set "entity with statements, one with a quantity qualifier" (Wikibase\DataModel\Entity\Item Object (...), array('P7=string|20')) TypeError: Argument 1 passed to MediaWikiIntegrationTestCase::{closure}() must be an instance of Wikibase\DataModel\Entity\EntityIdValue, instance of DataValues\UnDeserializableValue given, called in /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php on line 177 /workspace/src/extensions/Wikibase/repo/WikibaseRepo.datatypes.php:421 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementsField.php:177 /workspace/src/extensions/WikibaseCirrusSearch/src/Fields/StatementQuantityField.php:82 /workspace/src/extensions/WikibaseCirrusSearch/tests/phpunit/Fields/StatementQuantityFieldTest.php:105 phpvfscomposer:///workspace/src/vendor/phpunit/phpunit/phpunit:106
Presumably related to our work in T369149, though it’s not yet clear what the problem is. Annoyingly, I can’t reproduce the error locally.