First, finding documentation on the Other / NOTE section is VERY difficult given its name. It needs to come up in topic lists or be easier to find in some other way. Not being able to find the specific documentation on it, I went to Nia, but...
Nia categorically lied in one conversation about the contents of Other / NOTE would NOT appear in exported prose. However, it does.
This appears to be the bug. By definition, a note is not part of a story. It does not matter if it is just another type of section which is part of a story, a note as named should not be part of the exported prose.
RELATED: I wanted to do a Codex Progression to link 2 characters that got engaged and the place in the prose where it happened. Codex Progression does not allow for having more than one Codex entry. In this case, shouldn't the Codex for each character reflect this without having to create two separate entries? It would be nice to enable the ability to link an event to several Codex entries.
Primary bug is that Note Section documentation, exporting to prose, and making sure Nia knows the correct answer.