Hi again all, all of the fixed soaks (6 of them) are still running without a freeze after more than 12 hours now and we have managed to reproduce this in a new project created from a binary distribution of 4.17.2 : 5/6 tests failed within the first 2 hours!
I would highly recommend everyone experiencing this issue try removing actor/component code or assets changing tickgroup from their tests to see if they can get clear of the freeze.
It is still possible there are other causes, but I am really hoping that this information helps some if not all of you.
I have provided . with a link to download the test project in 4.17 so that Epic’s engineers can play with it.