There are cases where the tracklist of a release lists tracks that differ from each other with a trailing number, but are not titled as parts.

For example:
https://musicbrainz.org/release/c1f6d075-18ef-399c-ab66-edcc6399c8e9

Some editors misinterpret "Titles#Series numbering" (in my opinion), when they are adding "Part" to titles like that. Titles that do not have "part" or "volume" written on the release should not have that in MB either. I think we need an example in Style/Titles#Series_numbering

My proposal for an example (to be added in the guidelines):
Nattestid ser porten vid 4 (does not have part or volume written in the title)