Hi @AmberV and thanks for getting back to me on this so quickly!
- I mention import/export explicitly, as this bug refers to what happens if I export comments in an imported docx document with comments which got automatically converted to RTF and is compiled with the target docx on export
when I follow the instructions I gave in the post above, this is what is shown in Scrivener:

on export, this is the result in the word document

If I am overwriting a comment by placing my subsequent comment too close to the previous one (more on that in a moment), I need to see that immediately within Scrivener, not on export. That is too late and confusing and makes managing a document with a lot of comments unfeasible.
On when a comment actually overwrites a previous one:
My intuitive reaction was that one marked up spot in a document should be able to contain several comments. I say that, because it is how Word handles comments. But that is more like a feature request.
However, when I saw that adding a comment (to reply to the previous one) within the same content overwrites, I tried placing the cursor right next to the highlighted area which means “no whitespace between, but next to it”. That overwrites the previous comment, too - but only in the exported version! I need to see immediately that this happens on export. Or something is going wrong on export.
In general, I would kind of prefer a behaviour where one highlight can belong to several comments, because right now, in order to react to commentary by editors, I would have to either edit their comment or add another comment belonging to some other area of the document which is confusing even if it’s close by.
At any rate, if comments are being exported as overwritten due to how Scrivener handles the relationships between comments and highlighted text I need to see that immediately, because if it happens on export only it makes several rounds of revisions with to and fro between two people handling a large document with many comments quite confusing.
Hope that clarifies what this is about?