14 files declare their use of EntityContextDefinition

ContextHandlerTest.php in core/tests/Drupal/KernelTests/Core/Plugin/ContextHandlerTest.php
ContextPluginTest.php in core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
DefaultsSectionStorageTest.php in core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php
DefaultsSectionStorageTest.php in core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php
Entity.php in core/modules/views/src/Plugin/views/argument_validator/Entity.php
EntityContextDefinitionDeprecationTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/EntityContextDefinitionDeprecationTest.php
EntityContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/EntityContextDefinitionIsSatisfiedTest.php
ExtraFieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/ExtraFieldBlockDeriver.php
FieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/FieldBlockDeriver.php
FieldBlockTest.php in core/modules/layout_builder/tests/src/Kernel/FieldBlockTest.php
MockBlockManager.php in core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php
NodeRouteContext.php in core/modules/node/src/ContextProvider/NodeRouteContext.php
OptionalContextConditionTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Condition/OptionalContextConditionTest.php
PluginTestBase.php in core/tests/Drupal/KernelTests/Core/Plugin/PluginTestBase.php

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