As the title says, some mobs are affected by this bug, when spawned on magma blocks there is a chance in which they dont take damage unless they move which never happens unless you move them.
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[Mod] OcelotOnesie
Thank you for your report!
We're already tracking this issue at MCPE-47518, 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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