Loading buffet world from pre2 into pre3 resets generation settings

Was this world originally generated in Pre-release 1?

I think it was either pre1 or pre2, you can try to reproduce it.

Pre-release 1 was very broken, worlds generated in that version can potentially encounter issues like this. Please try to reproduce this on a world generated in Pre-release 2, and if you can, please provide the exact reproduction steps.

You can mark this as resolved since I loaded a floating world from 1.15 into pre4 and had no chunk errors.