Apologies if this is already a known issue.
Sequence to reproduce issue:
♦ Create a Primary Tag. (Main Tag)
♦ Create another Primary Tag (Other Tag)
♦ Create a new post in Primary Tag. (Test Post)
♦ Move first Primary Tag (Main Tag) to secondary tag section.
♦ Add secondary tag (Main Test Tag) to be exclusive to the second Primary Tag (Other Tag)
Expected result:
(New Post) should show for tags Other Tag
Main Tag
like this:
(The forum should respect that all posts inside the Main Tag should account for it now being a secondary tag and it should add the extra tag)
What really happens: (All previous posts in the Main Tag [when tag was primary] do not include that they now belong in the Other Tag category)
So if a Flarum forum becomes difficult to manage and Main categories become Secondary categories, all posts will need to be manually edited to include tag changes.