6 methods override BlockPluginTrait::createPlaceholder()

BlockContentBlock::createPlaceholder in core/modules/block_content/src/Plugin/Block/BlockContentBlock.php
LocalActionsBlock::createPlaceholder in core/lib/Drupal/Core/Menu/Plugin/Block/LocalActionsBlock.php
LocalTasksBlock::createPlaceholder in core/lib/Drupal/Core/Menu/Plugin/Block/LocalTasksBlock.php
SystemBreadcrumbBlock::createPlaceholder in core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php
SystemMenuBlock::createPlaceholder in core/modules/system/src/Plugin/Block/SystemMenuBlock.php
ViewsBlockBase::createPlaceholder in core/modules/views/src/Plugin/Block/ViewsBlockBase.php

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