2つのDiscourseサイトでBlackblazeバケットに異なる数のフォルダがあります

[JammyDodger]

This topic has a few details about the Discourse ‘Tombstone’ folder:

Deleting user images when using the rails console to delete users

They’ll get deleted eventually. A process runs and moves unlinked images to a “tombstone” directory and then they get deleted 30 days later.