i can't seem to reproduce this bug. however, i know controller input is extremely buggy for the game right now ( :c i have no clue why. ) when you select the tail whip action do you see a leaf appear over the enemy? the game waits for you to press "submit" aka E/Space again to confirm the action, you can also back out of the action with Q/Shift
edit:
while testing this i found an unrelated crashing bug with the bunth. this helped me patch it thanks!