Bug affects only the servers with high tickrates, if you have standard 30 tick - do not install this plugin. It's fixes FOV issues when reloading weapon, but bug still occurs when you falling (not jumping). I have tried to fix it too with OnPlayerRunCmd, OnPreThink, OnPostThink and get stuck with it. Any way.. major headache was the reloading of the weapon. If you have an idea how to fix the rest - let us know.
Gamedata and some code was taken from Unscope Sniper On Shoot
plugin, so credits going to Silvers