When fire is lit by Clint and steel, there is no animation. It still emits particles though. Same goes for the Nether Portal.
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Thank you for your report!
We're tracking this issue in MCPE-76180, so this ticket is being resolved and linked as a duplicate.
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Nicholas Jay, I am in the newest Beta version. Also on a different platform that you use I bet. I'm in MCPE Beta for Kindle Fire.

The latest beta release for all platforms is 1.16.0.63. Make sure you're using that, as bug reports made for older betas (apart from the W10 RTX ones) are invalid.
You're a couple of betas behind; the animation issues you're describing were already patched.