No bootpicker. I re-read post 594 and did not see any hotkeys to press to get to it? If I reboot, it is black for a minute, then goes to my logon screen. If I hold down option after the chime (a guess on my part since that is how apple does it), it hangs, and pressing the power button shuts it down immediately (no long press needed).
I don't have any other drives or OS's installed right now. Do they need to be installed for the menu to show up? I do have Win 10 on a separate SSD and OS10.15 on a separate NVMe I can re-install to test, if you deem necessary. Thanks.
Edit, I put in my 10.15 NVMe drive, and it made no difference on the bootpicker showing up. I was able to select it as the boot disk using system preferences. PS, I tried playing the jellyfish file on that, it it stuttered most of the way though. What a difference hardware acceleration makes.