I think the problem is the voltage, the grove port in the Alvik robot is providing 3.3v, also the grove connector of the Cytron Maker Nano RP2040.
According what I read in the docs and also in this page (Grove Vision V2 Powered Pool Alert - Cranberry Grape | Cosmic Bee | Tim Lovett) the Grove Vision Ai V2 needs a grove connector with 5v. In my case the Grove Vision works with Alvik but it’s very unstable. I don’t know if anyone can confirm my suspicions.
Thanks!