It has been reported that the translate block not working under some circumstances because of the following fatal error:
Call to undefined method Drupal\layout_builder_st\Form\BlockContentInlineBlockTranslateForm::getSectionStorage() in Drupal\layout_builder\Plugin\Field\FieldWidget\LayoutBuilderWidget->getSectionStorage()
Can be also the case that a custom form alter assumes that the methods getSectionStorage, getCurrentSection or getCurrentComponent exist since those methos are present on the layout_builder core form when editing the component on the default language: \Drupal\layout_builder\Form\ConfigureBlockFormBase
Would be interesting to add those methods to the BlockContentInlineBlockTranslateForm to have parity with the ConfigureBlockFormBase
Needs review
Code