In fight mode the bar on the bottom right is always empty and no one can fight (The animations dont start and you cant hit anything)

Also in survival singleplayer with the same mods everything works

My mod version is EpicFightMod-1.16.5-4.1.6

and other mods on my server are

BetterThirdPerson-Forge-1.16.4-1.5.1

CreativeCore_v2.2.1_mc1.16.5

EnhancedVisuals_v1.3.32_mc1.16.5

YungsApi-1.16.4-Forge-12

I installed version 5.1.1 and now everything works