epicfight is changing all the animations, the flying animation doesn't work.
I guess its on their end but I am not sure, so I report to both.
I also link their mod
https://www.curseforge.com/minecraft/mc-mods/epic-fight-mod
(made by Yesssssman)
thx for the time.

my bad, I was a little fast in reporting, I was playing around, setting filter_animation = true in their epicfight-client.toml will fix it.