Thank you
@pastrychef.
I added the -v boot arg using plistedit pro following your advices.
But I get the same problem: after the NVRAM error report I get a menu see first picture in which EFI is highlighted.
but after that I get a black screen, no text in verbose mode is appearing just a black screen.
For info: I am booting from a M.2 NVMe instered into a external USB adapter. I use F12 at boot to select this drive for boot and not my internal Nvme SSD that contains my perfectly working clover configured EFI. The external SSD is a clone of the internal one (used CCC for that) but with the OC EFI instead.
Thank you!