Netboot hangs when interacting with the menu

[MasterBootRecord32]

Describe the bug
Netboot hangs when trying to interact with the menu on old hardware (infos at the end of the report).

To Reproduce
Steps to reproduce the behavior:

1. Boot up the computer ;
2. Press F12 to access boot menu ;
3. Start Netboot from the USB stick ;
4. The system successfully configures the ethernet connection ;
5. The menu appears on screen and the countdown before booting from HDD is decreasing ;
6. Press a key on the keyboard ;
7. The system hangs and you are unable to interact with the computer anymore.

Expected behavior
When pressing arrow keys, the option below should be highlighted.

Video
https://user-images.githubusercontent.com/117741516/220429432-e51ef17f-552a-4882-9fff-0cf24248bccf.mp4

Additional context
I am trying to install a new OS using Netboot on 2011 hardware :
Toshiba Satellite L755D using AMD A6-3400M processor and Radeon HD 6520G.
Stock 2011 Legacy Phoenix bios.

The solutions I tried
Testing the USB key on another USB port : same problem than before.
Testing the USB key on another laptop : Netboot works perfectly fine.
Flash again the USB key using the latest official Netboot version : same problem than before.
Let the countdown reach 0 and let it boot from HDD : the system reboot straight into Netboot without trying to boot on HDD.

[antonym]

Converting to discussions as it's not really a netboot.xyz project bug. Only thing I can suggest is that it may not like the keyboard built in, you could try attaching a USB keyboard to see if that helps any or play around with the settings in the BIOS to see if there is anything that can be tuned.

I'd raise it upstream with iPXE or see if other people have has similar issues with that hardware. You might also try just using iPXE by itself to see if you get any different behavior.