I just found that when there is ossia present in a part, the explode function will not work properly.
In this case I am working with exploding 2 oboe parts on one staff to one part per stave. There is an ossia for each of the oboes so I add ossia above from bar 41:2 to end of 44. (Meter 3/4). When trying to explode anything, later or earlier in the piece, after this operation, there is only one line visible. The second one ends up in the ossia for oboe 2, that is not even visible. When I add the ossia in that bar the second oboe line is there…
The problem is now that not even deleting the ossias will get my explode function back to normal.
Can you reproduce this?