Oh no, what a shame...
I'm sure Night Hawk has lots of programming experience, unfortunately he's apparently unfamiliar with the mechanics of how RenPy saves work & their reliance on maintaining RPYC files for save comparability between releases.
To reiterate, Night Hawk is mistaken on this matter. The SG patch now includes an RPYC file. As with all RenPy games, use the included RPYC if you don't want rollback errors and broken saves in the future.
Sadly Night Hawk's reluctance to consider advice means he's unlikely to see this information, and will continue to operate under a misconception on the importance of retaining RPYC files to maintain save comparability.
Given my ignorance & cluelesness, people will have to make up their own mind about who has the wrong end of the stick on this issue.