this issue is not related to MCPE-12516. it is a baby chicken only bug. if it were related to MCPE-12516, then it wouldn't exist! it is still in 0.15.6.
set out a dispenser with a lever. set a cauldron next to it's output and cover it with something like a carpet. put spawn eggs in the dispenser. if the egg spawns an adult, it will stay in the cauldron. if it spawns a baby, the baby will jump out over the carpet. if you were to put lava over the cauldron so that when the baby grew it would be cooked, it doesn't work because the baby always jumps up immediately and dies.
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This issue relates to MCPE-12516 because it is about mobs being inside cauldrons and whether or not that is supposed to happen. This issue isn't a duplicate of that bug because this issue deals with whether or not particular size mobs should be confined within cauldrons once they are placed in them from a dispenser.
Using your example on my Samsung Galaxy S6 (SM-G920W8), Android 5.1.1, but replacing chicken spawn eggs with zombie spawn eggs, only the baby zombie would spawn inside (and stay inside) the cauldron. Replacing those eggs with silverfish eggs, the silverfish always stayed in the cauldron.
[Mojang] Mega_Spud (Jay)
Adult chickens (from spawn eggs) will spawn inside the cauldron, but baby chickens (from normal eggs) seem to spawn on top of the dispenser, as pictured:
[media][media]
[Mojang] Mega_Spud (Jay)
Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue, then please comment below and update the ticket description following the Issue Guidelines.
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