Villagers and Iron golems usually leave there villagers and never come back it.
This bug its present since versions 0.14.0 and up.
Game mode incudes survival .
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[media][media]

Just like 0.9.0 to 0.11.0, this bug its not present in 0.12.0 and 0.13.0.
Duplicate of your own ticket MCPE-13007 which is still a duplicate of MCPE-13602.
Please do not create duplicate tickets (especially your own!!), it just makes the process of fixing the bugs reported more complicated.