Drowned mobs can spawn in caves, when it's night or when it is raining although they should only spawn in oceans/rivers/swamps (just like in Java Edition). (Samsung Galaxy S4 GT-I9505)
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[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-40783 due to the more general or descriptive summary.
Your votes, additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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