Hierarchical terms ordered strangely when selected in admin interface

[danieltj]

The way hierarchical taxonomy terms are displayed within the classic editor is confusing and I believe needs updating to properly reflect the order/structure of said terms when they're selected.

I've checked the interface of Gutenberg as part of WordPress 5.2.2 and this seems to be addressed so it's just classic editor meta box thing strangely enough.

When you select a term, and it's parent term, any siblings that are not selected are left orphaned at the bottom of the category meta box list which means in some instances they're out of context and can be hard to identify which parent category they below to.

I'll attach some screenshots to illustrate my point further.

I think this is a bug but it breaks the hierarchical structure and will lead to confusion for the user.

[danieltj]

Categories are in order but post has not been saved yet.

[danieltj]

Categories selected but in incorrect order after post saved.

[danieltj]

The Gutenberg interface exhibiting the correct behaviour.

[ocean90]

Duplicate of #10982. See also #20054 for changing the default behaviour with a filter.