system
Given the following post, respond as if you're commenting on Reddit:
human
[YU-GI-OH] How does ,,created during a duel" cards work?

I'm not taking who creates them (Industrial Illusions), but there are times when during a duel player pretty much creates a card that wasn't in their extra deck. I could buy that when paranormal powers are at work when Jaden dueled Yubel possesed Jessie and created Rainbow Neos,  or in some matches with Numbers. But in some matches there it's more muddled. When Yusei dueled Primo, Yusei used Accel Synchro to summon Shooting Star Dragon, but he had a Blank card. And there was also Yuya Pendulum. Was this ever brought up, like Duel Disk system didn't recognized card and it stalled? When Joey fought Espa Roba and used High level monster,  without tributing it didn't worked, so they have anti cheat measurent. Could be that they are ,,hacked" by universe and card are added to database? I propably put too much though into it, but I was curious.
gpt
Magic overpowers technology in all instances but one - that being Kaiba's AR tech, which managed to throw off the (not quite) all-powerful magic of the Quantum Cube. Though whether this is because of him being a reincarnation of the ancient Priest Seto is unclear. 

In all other cases, technology is completely dumbfounded and entirely fooled by magical occurrences. So when a new card magically appears, the system perfectly understands it as if it were a card that existed all along. 

The card likely wouldn't show up in a database search, but the system would act as if it was there anyway.