Crash when switching voices if notes are tied
1. Open the attached file Crash_Boom_Bang.mscw
2. Switch to voice two (I used Cmd+Opt+2 for that).
The document has been created with two staffs, Soprano and Alto, and a Part has been added that includes Soprano voice 1 and Alto voice 2. The Soprano and Alto voices have been Imploded. This is an odd combination of things, but one that I managed to accidentally create (and then experimentally tried to recreate for a while after).
Also attached is the backtrace generated for this file on my Mac running macOS 10.14.6