Yeah, i've found my fair share of errors, or things that are left ambiguous in the card description, specially yesterday, my lowpoint in 10 months of Gwent...
I can confirm OP's 1. error - i use Kambi a lot and i've had NR buffers buff Kambi from the Graveyard.
Another Kambi related glitch i found - well actually its more of a savage bear glitch - i use frost and savage bear to kill Kambi so opponent cant react and Hemdall is triggered instantly. And yesterday, when facing NR, he had one of those units that boost entering units by 1, but i had frost and bear. So when i put Kambi, he would go 1->2 but then either frost or bear would kill him (there were no units on that row with less points). And yet, somehow those 2 damages nullified each other and Kambi was left with 1 pt and i lost. WTH CDPR, you're just making Kambi harder and harder to use.