My metahuman is missing hairs in the packaged game. We have tried multiple forums but none of the solutions worked.
Here is a list of what we tried
Adding Alembic Groom and groom plugin - also making sure that .uproject has
“Name”: “HairStrands”,
“Enabled”: true
Changing LODsync of forced LOD from 0 to 1
Changing face and body’s Bound Scale from 0 to 100
I’m also having this issue and have also tried everything people have suggested in the past, really frustrating. It works fine when running as a standalone game but not when packaged (applying to both eyelashes and head hair).
I’m on 5.3.0
I think I’ve just solved this - for some reason the binding asset on the blueprint in the scene had gone missing and this was causing the issue. I’m not sure why it changed from the BP default, I didn’t modify this and I’m not sure why it works fine without the binding asset until the project is packaged. 
This was the solution for us, so we have to set D3D12 Target Shader formats to only include the SM6 in the project setting.
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