I couldn't find similar issues, so I am opening my own. I was making a custom modpack and on startup, I see a lot of parsing errors. I can't find the exact cause as to why it is this way.
The relevant log:
new 1.txt

It does not crash the server, but this amount of errors feels insane. Is this intended?

This is not intended but also none of the parsing errors are from biomeswevegone
Coming from:

• regions_unexplored
• biomesoplenty

This is not intended but also none of the parsing errors are from biomeswevegone Coming from:

* regions_unexplored

* biomesoplenty

If only I was using those mods. I don't have them and don't use them, neither on client or server.

Did you ever have them installed or does the world you're using ever have them, its the only possible reason

Did you ever have them installed or does the world you're using ever have them, its the only possible reason

It's a brand new world. I did not have them installed at any point. This is the sole reason I decided to write here since I wasn't able to trace the issue and the only thing I could think of is this particular mod which I do use.

I have identified the root cause - sorry for the incorrect issue.