Hello,
i’ve got a problem with Ue5.5.4 and Groom with Phisycs on.
You can find a quick vide that shows the problem here (youtube link )
As you can see the groom simulation looks pretty good overall apart from the head.
For some reasons the hair of the head intersect the head geometry quite a lot.
i’ve tried many different phisics settings but it seems i cannot fix the problem.
With the phisycs off, the binding of the groom with the skeletal mesh is perfect.
The problem comes when phisycs is on…
I’m not very good with groom phisyc therefore i ask for your help.
Please… 
i’m sure i’m doing things wrong ….