11 files declare their use of DerivativeInspectionInterface in Drupal 9

BlockPluginInterface.php in core/lib/Drupal/Core/Block/BlockPluginInterface.php

HelpTopicPluginInterface.php in core/modules/help_topics/src/HelpTopicPluginInterface.php

LayoutBuilderEntityViewDisplay.php in core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php

LayoutEntityHelperTrait.php in core/modules/layout_builder/src/LayoutEntityHelperTrait.php

LayoutEntityHelperTraitTest.php in core/modules/layout_builder/tests/src/Unit/LayoutEntityHelperTraitTest.php

LayoutInterface.php in core/lib/Drupal/Core/Layout/LayoutInterface.php

media.module in core/modules/media/media.module

Provides media items.

MenuLinkInterface.php in core/lib/Drupal/Core/Menu/MenuLinkInterface.php

MigrationInterface.php in core/modules/migrate/src/Plugin/MigrationInterface.php

ViewsPluginInterface.php in core/modules/views/src/Plugin/views/ViewsPluginInterface.php

WorkflowTypeInterface.php in core/modules/workflows/src/WorkflowTypeInterface.php