We recently upgraded UE4 to latest from a sync at some point last December and are seeing a new issue with how we deal with disabling collision response to custom channels defined in our project. If I tell a physical object to ignore another that is on a custom channel and then set simulate physics to false for a period and then turn it back on, it will seemingly clear the previous set ignore response and start colliding with the other object. Is this a bug? If so is there a fix we can implement to prevent this?
I think this may only be ignoring the response channel setting for the frame in which simulate physics is turned back on.
I verified what is happening. When you turn back on simulate physics, we are receiving Event Hit callbacks for entities that are set to ignore each other. I can actually detect this and truly ignore them but I believe this is a bug.