Hair collisions utillize a Niagara particle sim, which runs on the GPU, while most standard game realtime physics run on the CPU. If you are lucky the next build will fix your isdue with DX12. I did some changes to Niagara Sim Settings, because I had a similar issue with my particle system not correctly activating at runtime. I can also add Vulkan as a supported RHI
Thanks! Yeah fix would be appreciated. Just for your information though, collisions were broken on more than just the hair, don't ask me how. Pretty much all the soft bodies like the mouth or but had the collision shifted vertically. Maybe it is not a dx issue, but i tried all settings and only when i switched to dx11 it was fixed.