Windows10 Anniversary/Creators Updates - memory problem on bhyve

I have a problem with Windows 10 Anniversary update on bhyve.
When I try to update, installer reports too low memory! (At least 2GB required)
I've set 8GB, task manager shows 8GB, available is 7GB.

Is this the problem with bhyve?
I have Hyper-V as well and there wasn't any problem with the anniversary update.
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