6 files declare their use of LayoutBuilderContextTrait

ChooseBlockController.php in core/modules/layout_builder/src/Controller/ChooseBlockController.php
ChooseSectionController.php in core/modules/layout_builder/src/Controller/ChooseSectionController.php
ConfigureBlockFormBase.php in core/modules/layout_builder/src/Form/ConfigureBlockFormBase.php
ConfigureSectionForm.php in core/modules/layout_builder/src/Form/ConfigureSectionForm.php
LayoutBuilder.php in core/modules/layout_builder/src/Element/LayoutBuilder.php
MoveBlockForm.php in core/modules/layout_builder/src/Form/MoveBlockForm.php