I just tried the new 251209.iso on my laptop, Asus VivoBook M513UA.
There was no problem booting into the live ISO or with installing it suggesting there is definitely a hardware issue with my PC.
That said it’s still an ISO problem because the problem didn’t previously exist on the same PC with older ISO’s…
Just to let you know I tried installing the November ISO which is still listed as the official ISO in Announcements and I was successful.