Try different monitor indeed helps.
So this is my case (just have time to test it this morning) that explain the issue I met):
- in 2020 I tried a full HD Dell monitor and I can see the boot screen and logs from that monitor
- in 2023 I tried again on a 2K LG monitor and it shows nothing on screen
So as SteeMan said : SD card quality and monitor type are the factor we need to check when we encounter this 'HDMI boot issue'
Cheers.