About a month ago (few versions of unit ago) I have submitted a bug. https://issuetracker.unity3d.com/is...r-size-in-the-initial-collision-of-a-particle It's a bug with simple particles collision. It is a regression bug meaning it was working in a previous versions. Since the nature of this bug is very straightforward I was expecting for it to be resolved in the next version. This problem is quite crucial to me, I don't know exactly what is the methodology unity team is using to order the issues for resolving. Is it voting ? Should I already start a campaign for it Well anyway if you find it important enough please vote. Just in case Best Regards.