I have tested the fixes in 4.19 preview 1 and rotating HISMC seems to be fixed. However, with HISMC there is still a problem if you have more instances spawned (at least 6) and you try to get certain instances transforms, add random values to them and update it. What happens is that sometimes two or more instances swap their per instance randomized colors. It is really random and higher sample size or the longer I am modifying transforms makes it worse.