What the title says - fire animations are not playing whatsoever, and show as a static fire image when on the player screen, or from blocks such as campfires or fire-blocks (the fire itself)
The video file is too big (112MB or so for a 1 min video) to upload here, so I've uploaded it to imgur in two parts and posted the links here.
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We're tracking this issue in MCPE-154117, so this ticket is being resolved and linked as a duplicate.
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