Double Bar lines do not extend between instruments

sample score needed as I can't reproduce using above steps

Pick a score, add double barlines, try to extend them and the double barlines will fail. I
* made a score with 3 flutes, choose your instruments,
* added a random double barline,
* tried to extend the double barline and it returned to the original position
* extended a single barline and only the single barline extended.

I reported this a week ago. In this case you don't really need an example file, a polyphonic template (without extended bar lines) should suffice. Somehow you don't really get back to the starting point with Undo. If you first extend the single bar lines and then insert other types (double, dashed...) it works.

see also here (only described a bit complicated):
https://musescore.org/en/node/282295

PS I have nevertheless added an example score

See also #274437: [2.X->3.0] Incorrect edit barlines markers behavior and #123436: Double barline doesn't appear on the staff of the added instrument. Definitely issue here that seem to depend on the specific order things are done in, because it does indeed work correctly at least some times.

If you first extend the single bar lines and then insert other types (double, dashed, ...) it seems to work. Later added staffs, however, lead to the same behaviour again, if you want to extend bar lines again.
The score should therefore already contain all the required staves. If something goes wrong, you have to reload the score. In my experience Undo does not work properly.

Overall, the "Span to next staff" should be your workaround, just set or clear this manually as needed. But it's needed way more than necessary. Barlines get marked as non-generated and then get stuck that way with no obvious way to reset them.

https://github.com/musescore/MuseScore/pull/4843

Fixed in branch master, commit 15c401fb06

fix #282696: extend non-generated barlines on staff span change

Automatically closed -- issue fixed for 2 weeks with no activity.