The speed of the fire animation in third person is really inconsistent. When you shift or sprint, the animation is fast. When you normally walk or stand still, the speed is slow.
How to reproduce: Stand on fire in creative mode while shifting and unshifting or sprinting
[Footage|https://photos.google.com/photo/AF1QipOgxhqAJjb2CyXUjPi7MqMYvRTVpmJFZ6duOc0_]
Thank you for your report!
We're actually already tracking this issue at MCPE-59122, so I will resolve and link this ticket as a duplicate.
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