According to your testing, does the issue occur with ONLY Immersive Portals mod installed?

Yes

Forge Version

21.1.180

ImmersivePortals Version

immersive_portals-6.0.7-all

Latest Log

https://mclo.gs/DMiKeyF

Crash Report (if applicable)

https://mclo.gs/iPHMIJb

Steps to Reproduce

1 have both immersive portals and armorer's workshop
2 use the advanced skin builder.
3 import bbmodel under the block option. ( might crash, if doesnt proceed to step 4)
4 export model to inventory
5 crashes by saving the world n kicking you out

What You Expected

I expected the model to load, exported and go into my inventory.

What Happened Instead

The game either crashed when loading a bbmodel in or crashing on exporting the model as an item into my inventory.

Additional Details

No response

Please Read and Confirm The Following

• I have confirmed this bug can be replicated without the use of Optifine.
• I have confirmed the details provided in this report are concise as possible and does not contained vague information (ie. Versions are properly recorded, answers to questions are clear).
• I have confirmed this does not happen on the fabric version (If it does please report to here instead).
• I have confirmed I'm not using a hybrid server (Magma, Cauldron) or a different (non official) Forge Server release.
• I have confirmed this issue is unique and has not been reported already.