Cosmetic / Minor issue
I have a solution with one underscore character in its file name. It is properly displayed in the window title bar, but undescore is missing in most recently used files, under File menu.

I made some complementary tests, with dummy solution files named Undescore_One.pbs, Undescore_One_Two.pbs and Undescore_One_Two_Three.pbs. Only the first underscore in the file name is missing in menu display:

I am using NI Package Builder 20.6.0.1227.
Regards,