Drumset edits have no effect after a change instrument object
1.) See the attached score file, the drum editor doesn't work at all, all changes get lost right after closing the editor.
2.) Deleting the change instrument text will make the drum set editor start working as expected.
Apparently, it seems that an instrument change causes edits to any drumset on the staff only affect the first drumset only (which in this case is not visible).
See more details in the forum thread below: