Multiple Crash and Delete Work Bug

I double clicked on the Section Marker - Musescore crashed and asked if I wanted to restore the session - I pressed yes. The session was restored as before - stupidly I accidentally double clicked again on the section marker and again musescore asked me if I wished to restore the session I said yes again - but this time it did not save the hour of work that i had done - and reverted back to the version which I had started at the beginning of this session. Crap. Serious bug I think. Jarl