Cascade Persist issue on EntityCombinedScreen

v.6.10.13

I have a deep composition with two levels. I was trying to set up the screens with an EntityCombinedScreen as the top level but I couldn’t get it to work. It kept giving me a Cascade PERSIST exception. I wound up having to switch the top level to a regular edit screen (ti worked) which isn’t a deal breaker just unexpected.

Are there any known issues with this arrangement of having a deep composition with an EntityCombinedScreen as the top level editor?

It works for me on the latest 7.1.