Scenes, sources, filters vanishing into thin air

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

30.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/9SQ8s1AZtw27PKPR

OBS Studio Crash Log URL

No response

Expected Behavior

Nothing (just OBS launching and loading my saved profiles as usual)

Current Behavior

My Scenes, sources, filters and scene transitions vanished. My audio mixer sources are still there. My OBS Settings are still there.

It seems the .JSON (attached below) got practically reset when I launched OBS today, though it is still twice much larger in file size than a newly created one.
Assetto Corsa.json

Steps to Reproduce

1. Likely changing GPU and/or reinstalling Windows
2. Start OBS and let it load the .JSON

Anything else we should know?

I've ran into this issue twice before, the first time was in 2014. Every time I stop using OBS and then years later return to OBS, only to find out that this honestly terrible issue still persists. I hope by personally reporting it, it can finally get squashed now.

Start by reviewing the OBS Studio log at https://obsproject.com/logs/9SQ8s1AZtw27PKPR and the attached Assetto Corsa.json, comparing the missing scenes, sources, filters, and transitions with the settings and audio mixer data that remain. Done means identifying a reproducible cause and preventing saved scene data from disappearing when OBS loads the profile.