GRUB not showing

I have this problem where, If i don’t turn on my monitor between the following:
Right after boot -> Before my pc starts loading grub

My monitor will be black, but i can interact with grub on my keyboard as if it was running. (example: press the down arrow a lot of times and then enter, will run the last entry in grub menu)

If i turn on my monitor before boot/have left it turned on and boot my pc, it doesn’t show, (Just black screen).

This seems to be cross-distro as it happened while I were on Arch linux too.

Maybe i configured something wrong?

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modify in /etc/default/grub
GRUB_TIMEOUT_STYLE=menu

sudo nano /etc/default/grub 
sudo update-grub

I have the exact same issue.
I’m using manjaro 20.1 cinnamon, and now i installed windows 10 to dual boot.
I reconfigured grub, but that didn’t help. As you said, i can interact with the grub menu while the screen is black.