Hi, I think Matcap has a small bug (maybe after the last update?). When using matcap with any camera (eg orbit control), small texture flaws appear. The normal map seems to be a little buggy to me too. When I use the instantiated mesh, the glitch disappear (with the exception of the normal map glitch). do you confirm that it is a bug?
Another thing, the ibl material doesn’t work with mobile devices (tested with chrome and firefox in android devices). Got a trick to use on your phone or not supported yet? Thanks : )