Version Information

Minecraft: 1.12.2
Forge: 2611
Mantle: 1.12-1.3.1.21
Natura: 1.12.2-4.3.2.42

Report Information

When I disable the setting "B:NaturaEntities" in the NaturaModules.cfg on client AND server, I get a "Fatally missing registry entries"-error. The server starts without a complain and also singleplayer works fine. But when I try to connect I get this error. When I turn this setting (only client-side) back on, everything works fine. On the server it can stay disabled.

[20:36:22] [Netty Client IO #0/ERROR]: Unidentified mapping from registry minecraft:items [20:36:22] [Netty Client IO #0/ERROR]: forestry:crated.natura.edibles.0: 5733 [20:36:22] [Netty Client IO #0/ERROR]: Network Disconnect: Fatally missing registry entries [20:36:27] [Netty Client IO #0/FATAL]: Failed to connect to server: there are 1 missing registry items

Steps to Reproduce

Forge Log

https://gist.github.com/Wishmaster3/1e5937169543dfed7a2ff02b1ccfb0b8

I get the same errors for the spiders if I have them activated.

I am having the same issue.

I generated a world with B:"Enable Heatscar Spiders"=false, and then later realized that I had done that by accident, and tried to set it to true.

On server restart, I noted in the logs that I got a warning:
[12:01:56] [Server thread/WARN] [FML]: Registry EntityEntry: Object did not get ID it asked for. Name: natura:babyheatscarspider Expected: 430 Got: 440
[12:01:56] [Server thread/WARN] [FML]: Registry EntityEntry: Object did not get ID it asked for. Name: natura:heatscarspider Expected: 429 Got: 441

Now, I am able to connect to the server fine. However another user is unable to connect, reporting the error:
[15:02:46] [main/ERROR]: Unidentified mapping from registry minecraft:entities
[15:02:46] [main/ERROR]: natura:heatscarspider: 441
[15:02:46] [main/ERROR]: natura:babyheatscarspider: 440
[15:02:46] [main/ERROR]: Network Disconnect: Fatally missing registry entries