Any updates on this?
I found out that DraStic (Nintendo DS emulator) also supports game shortcuts and suffers from the same problem on my device (shortcuts are renamed to ‘DraStic’ upon restart). So we know it’s nothing specific to Magic DosBox and its config or anything like that; it seems more likely to be a bug in my specific launcher, or an oversight in the shortcut code that Magic DosBox and DraStic use (again, Xash3d FWGS doesn’t suffer from this problem). Or possibly something specific to my device, but I feel that’s less likely.
I’ll try an alternate launcher this week maybe, assuming that I confirm that it won’t mess up my existing layout.