# Metahuman face PHYS asset losing edits upon BP Compile 

**URL:** <https://forums.unrealengine.com/t/metahuman-face-phys-asset-losing-edits-upon-bp-compile/2836187>\
**Category:** Issues and Bug Reporting (Unreal Engine)\
**Tags:** physics-asset, hairworks, unreal-engine, metahuman\
**Created:** [October 1, 2026, 6:58pm UTC](https://forums.unrealengine.com/t/metahuman-face-phys-asset-losing-edits-upon-bp-compile/2836187 "2026-10-01T18:58:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![PetkoGanev](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@PetkoGanev](https://forums.unrealengine.com/u/PetkoGanev)\
**Post date:** [October 1, 2026, 6:58pm UTC](https://forums.unrealengine.com/t/metahuman-face-phys-asset-losing-edits-upon-bp-compile/2836187/1 "2026-10-01T18:58:05Z")

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### Summary

Metahuman physics asset reverting to default state upon compiling BP or entering PIE.

### What Type of Bug are you experiencing?

Simulation

### Steps to Reproduce

1. Assemble a metahuman with long hairstyle, so the hair collision will be visible, and drop the resulting metahuman in the level;
2. Open the metahuman PHYS\_face physics asset(you can make a copy and point to it so it’s in ‘/Game’ if you’d like to be thorough, but it doesn’t matter);
3. In the Skeleton Tree on the left side, select ‘head’;
4. In the Details tab on the right side, under ‘Body setup’-\> ‘Primitives’ you’ll find the capsules and spheres that are ‘describing’ the collision shape for the head;
5. Under ‘spheres’, index 4 and 5 are R and L ears, pick any or both and set ‘Collision enabled’ parameter to ‘Collision enabled’;
6. Move the sphere in a way that let’s you see how the collision is affecting the hair in the level viewport;
7. Save the PHYS\_face physics asset;
8. Compile the BP or enter PIE;

### Expected Result

I expected the tweaks of the PHYS\_face asset to have an effect, resulting in working collision with the way I’ve setup the collision shapes.

### Observed Result

It’s as if the PHYS\_face reverts to default state, however the tweaks seem to be saved successfully. If I try to tweak the shapes further, I can see the effects live in the level viewport, until I compile or enter PIE, that’s when it breaks.

### Affects Versions

5.8

### Platform(s)

Windows