PIP problem in SatDreamGr 8 on VU+ 4K

I have found one specific problem on VU+ Ultimo 4K and Solo 4K. It is not possible to start PIP with clasic double blue button presses. This switches TV on satellite pannel. I searched where problem could be. If I switch in Setup - System - Expert setting - Display setup - Clone TV screen to LCD to "NO" PIP suddenly runs. Is it intended this should work such a way or is it some malfunction in firmware? Because till recent OpenPLI 8 firmware this two functions were separate.

I have already placed this topic on OpenPLI forum as well if SatDreamGr has its base in OpenPLI image. Both firmware behaves the same way.