Why is Unreal Game different in memory usage on iOS11 and iOS12?

Our game runs well on iOS11 without any memory problems and uses up to 700mb, but on iOS12 it comes up to 1.6GB. Also, memory measurements in most of the same scenes make a big difference. It would be all right if the amount of memory used seems to be different, but only in iOS 12, the game crashes out of memory. This is not just a measurement difference, but actually memory usage seems to be a different problem.

Hello,

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https://epicsupport.force.com/unrealengine/s/

Thanks