Itai
I have just ended my tests on V5.3.
I was able to replicate all the issues you described. It's definitely a bug we have to look into…for the next OS release.
As for now, there is a work_around. Storing any of these presets after having used the Patch Editor as you described will provide a working copy of the factory presets.
Sorry for the problem….and thsnk you for providing info on it.
all the best
I
