Context
Now this bug is very similar to my previous ticket #311.
I have a comparison here -> (1) and (2) to the #311 latest.log to this bug.
Just a fair warning, I'm not a modder and this could just be a duplicate ticket.

API/Modloader
I am now using a new forge compared to the #311 ticket.
[1.16.5] Forge 36.0.42
Same BYG version as before.

Describe the bug
I was just traveling around on my server on foot when I noticed chunks weren't loading anymore.
I go and check my server and see it's down.

To Reproduce
1.) Install a 1.16.5 Forge 36.0.42 server.
2.) Travel long distances in deserty/savanna biomes I guess? (that's where I was when it happened.)
3.) See crash/logs.

Expected Behavior
Not the server being murdered. Lol.

Logs
latest.log LINE 1641
debug.log LINE 7307

A work around for this crash atm is:
Old:

"hills": [
        {
          "name": "byg:fresh_water_lake",
          "weight": 5
        },
        {
          "name": "byg:red_oak_forest",
          "weight": 0
        }
      ]

New:

"hills": [
        {
          "name": "byg:fresh_water_lake",
          "weight": 5
        }
      ]