Drowned not path finding or taking damage underwater

Whenever I go to attack a drowned, it suddenly stops moving towards me and stays in place spinning around. It can still hit me, but it won't take any damage as long as it is spinning. I can usually stop the spinning by moving to the opposite side of the drowned or getting out of the water during night time, and then i can hit it again. Only happens to me in beta 1.15. I tried attacking drowned in 1.14 and it worked as it should.