Hello there, I am reaching out to share that this mod was the reason why I and others could not connect to my server I am hosting. It throughs this to players connecting but shows nothing in logs:

I found out it was this mod because I started to remake my modpack one mod at a time in alphabetical order and when I added Ars oscura it started throwing the previous picture for me and others.

I wish I could give you a crash/latest log with info but it doesn't show anything at all talking about the mod just says player disconnection sent twice.

Here is the modlist that I started to make when it crashed:
AdChimneys
AI
AdvancedPeripherals
appleskin
Apotheosis
ApothicAttributes
Aquaculture
architectury
ars_additions
ars_artifice
ars_creo
ars_elemental
ars_nouveau
ars_oscura
cc
create
curios
ForgeEndertech
Patchouli
Placebo

Please send the log regardless