[MCPE-39835] Zombie/un-dead stop burning during daylight if they're stood on lower slabs

Mobs stop burning from daylight if they're stood on a lower halfslab.

Steps to replicate,

set a large area to lower halfslabs
Spawn some un-dead
Make sure the time is set to day.

Linked issues

Thank you for your report!
However, this issue is a Duplicate of MCPE-32822.

If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.

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