Some of the mob animations are broken, as keyframes are being used as regular frames instead.
Affected mobs (may be incomplete):
-Chicken (Flapping wings)
-Parrot (Flapping wings)
-Shulker (Opening/Closing shell)
MCPE-43528
Some of the mob animations have low framerate
Resolved
Duplicate
3
(Unassigned)
Unconfirmed
Windows
Windows 10
1.13.0.1 Beta, 1.12.0.14 Beta, 1.12.0.13 Beta, 1.11.0.10 Beta, 1.11.0.5 Beta, ..., 1.12.0.3 Beta, 1.12.0.4 Beta, 1.11.1, 1.11.2, 1.11.4
Retrieved
There is one mob animation which is glitchy, and it is the vindicator's though it is not clunky. See MCPE-43643