bad eighth/sixteenth note bars autoinserted
Working fine then I changed the bars for a three note pattern of individual noteheads to two sixteenths and an eighth with connected bars. Now it extends bars for all eighth/sixteenth notes into the preceding or following eighth/sixteenth rest which often causes the group to extend into note groups in neighboring measures.
Also, I deleted some notes to make them rests and I suddenly got a big vertical gap in the score with a solid black line in it that I cannot delete.
The project started as a piano score .xml import. I copied the treble clef from there and pasted it into a newly created Musescore file with treble clef only.