10 files declare their use of BlockManagerInterface in Drupal 9

Block.php in core/modules/views/src/Plugin/views/display/Block.php

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

BlockContentBlock.php in core/modules/block_content/src/Plugin/Block/BlockContentBlock.php

BlockLibraryController.php in core/modules/block/src/Controller/BlockLibraryController.php

CategoryAutocompleteController.php in core/modules/block/src/Controller/CategoryAutocompleteController.php

ChooseBlockController.php in core/modules/layout_builder/src/Controller/ChooseBlockController.php

ConfigureBlockFormBase.php in core/modules/layout_builder/src/Form/ConfigureBlockFormBase.php

NegotiationConfigureForm.php in core/modules/language/src/Form/NegotiationConfigureForm.php

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

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