[MCPE-119678] Instant_health effect not applied to undead mobs

I used the /effect command to apply instant_health to undead mobs.

However, they did not receive any damage.

There is no problem with the potion effect.

It looks like a bug in /effect.

Linked issues

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We're tracking this issue in MCPE-32738, so this ticket is being resolved and linked as a duplicate.

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