I am not finding anything to suggest that “Marvel Action: Spider-Man, Vol. 2” #4-6 (with variants) exist.
From “MARVEL’S SPIDER-MAN ANIMATED SERIES WIKI”:
“Because of the Coronavirus pandemic, there was a three month gap between issues 2 and 3 of volume 2. This also resulted in issue 4, the beginning of a new story arc, being pushed back multiple times until it was cancelled in favor of a soft-reboot of the comic series with a different writer and artist.”
There is no evidence of their claim that I can see, though I do recall that a ton of books were cancelled early in the pandemic.
But Marvel.com only lists three issues. That’s certainly a bit more reliable.
Unless you can find anything to suggest otherwise, I’d recommend deleting 4-6 (with variants).