This is complicated and can have many reasons
First read this
the problem is ofcause that the project notes (composition) are also lost
a 'fix' could be an option in the edit menu there for a conversion of <myfile>.mmpz to <myfile>.mmp
This conversion should be executed without loading, ofcause..
The resulting mmp could then be manually edited in any xml editor.
A more elaborated solutuon would be to have a 'strip' option for hanging vsts. This would remove the vsts-instrument and replace with a simple 3oc, preserving notes and FX inserts
the second solution may be 'smarter' but not as versatile as the <myfile>.mmpz to <myfile>.mmp, which could be used in other circumstances.
Anywhitch, the situation with lost projects caused by frozen vsts loading, need to be adressed.