If you hold right click while drinking milk, the animation will loop.
MCPE-56162
Milk item bug
Resolved
Duplicate
1
Cole Brennan
(Unassigned)
Unconfirmed
Windows
1.14.0.4 Beta
Retrieved
This is also an issue in 1.13.1 mcpe, the effect of drinking will apply but the animaton will continue until you release it, very easy to reproduce in my case at least, happens every time I need to remove "bad omen".