It just looks like game tries to predict when you fall in lava, but if you manage to trick it like I did in the video, you catch fire anyway. First time I got this bug in Realms, but apparently in singleplayer nothing changes either. Sorry for poor quality, there's nothing I can do with 10MB limitation, should be enough.
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-65094, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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