Bug? Remove annotations removed the entire note across multiple resources

I like to organize my Mobile Ed notes by course, then by segment.

So, for HB101, I keep all my notes in "📚My HB101 notes", with a separate note for each segment:

Each segment's notes have multiple attachments from both the transcript, and the readings for that segment.

I had started a new note (by highlighting some text from HB101 segment 15), then started the readings from Beginning Biblical Hebrew (BBH) and added a few attachments from that resource.

I realized that I wanted to make a different selection for one of the BBH attachments, so I selected the annotated selection from BBH and chose "Remove annotations," expecting that it would only remove that one annotation from the note it was attached to.

Instead it removed the entire note for segment 15, along with every attachment. The transcript as well as the BBH reading now had no other notes.

Is that the expected behavior of "Remove annotations" from a small selection of text in one resource actually removes all attachments along with the original note from other resources?

If it matters, I had "Edit attachment points" enabled in the note itself, as I was in the process of adding other notes for the segment.

Normally I use "Open annotation," then delete the specific attachment by hand.

I do understand that "Remove annotations" will remove all annotations for a larger scope than the selection, if the larger annotation is part of the selection. But in this case, it removed annotations from unrelated selections in the BBH text, as well as ones from a completely different resource (the transcript).