Black screen on 3840x1600 wide screen display

[JazzTech]

I have a Dell AW3821DW 3840x1600 wide-screen gaming monitor connected to a Nvidia RTX 3080 GPU over a DisplayPort connection.

When initially booting into Ventoy with Secure Boot enabled in BIOS, I expected the UEFIinSecureBoot to indicate a boot security failure and bring up the screens for the initial MOK registration.

However, I only see a black screen, without a cursor.

When I disconnected the 3840x1600 wide screen and connected an old 1024x1280 screen to my GPU over an HDMI connection, I do see the expected UEFIinSecureBoot boot security failure displays when I rebooted Ventoy.

Something is preventing the UEFIinSecureBoot from displaying properly on my 3840x1600 display.