concurrency issue? on NF 26.1.2

[Floi1]

Describe the bug
When loading into a world resulted in the client not loading correctly
embeddedt/ModernFix#639 (comment)

To Reproduce
Steps to reproduce the behavior:

1. load up a world
2. error saying invalid player data

note this has only happened once and after a reload it seem to work fine now

Expected behavior
load up a world normally

Screenshots
Sadly did not take a screenshot when it happened

Crashlog
2026-04-12-1 (2).log.gz

(please complete the following information):
MC- 26.1.2
entity_model_features_26.1-neoforge-3.0.17

Modlist