Yea, I accidentally downgraded to 2091 today (it was early), so I think it still had the vintage package there, but it wasn't disabled. I quickly reran my script, updated to 2101. Unfortunately this didn't fix the problem. I checked global settings and it still had Vintage as being ignored. I tried a few things, but ultimately, I had to do a 'real' exit and reopen sublime. I tried reopening the project / switching projects, and it had the same effect.
My guess is maybe there is a flag in sublime that says hey im in vintage mode. When I opened 2091, it loaded vintage, that was set. I did a hot exit and that was saved somewhere. I reopened 2101 and that flag was still there?