titanic hydra's active stunning/stopping Auto attacks for a brief moment

i tested on hit jax on training so i noticed that when i attack with 2.5 attack speed and then activate titanic hydra, it makes jax stop for 1-2 seconds and interrupting his DPS

is this a new bug ? because i though hydras should smoothen the combo/animations not stun my character and stopping him from auto attacking

a friend also plays jarvan with titanic hydra and he noticed his combo is not the same as he happens to be stunned for no reason