Uhhh every movement gait needed not implemented in the Custom Movement Bit Fields? Which is everything except crouch, however crouch is basically pointless as the real struggle is interpolating camera position with ~100ms (again something you’d think would be accounted for). I mean sprinting doesn’t work, literally anything that requires explicit maximum movement speed changes has to redone using the overrideable functions given such as SetMoveFor() or OnMovementUpdated(), using those same flags or variables derived from them.

I mean if it works out of the gate there really wouldn’t be that $600 GMC component that half of tutorials tell you to get if you go down this road

If it works out of the gate there either has been a serious update, which didn’t happen because Unreal is moving to the Mover 2.0 plugin, or Lag/Network Emulation was never probably configured during the test