I was noticing this and decided to comment on it. At the beginning of Episode II, Ob-Wan claimed that he and Anakin had fallen into a nest of Gundarks, Anakin corrected him and said, "you fell into that nightmare and, I rescued you, remember?" I'm wondering if the producers of the Clone Wars forgot this. In season 1 episode "Dooku Captured" Anakin and Obi-Wan had (another) encounter with a Gundark on Vanqor? Anakin asks, "I thought Gundarks are only on Vanqor?" Obi-Wan: "Then this must be Vanqor." Anakin: "Then this must be....""Obi-Wan: The mother of all Gundarks, precisely!" Strange there is no reference to their earlier encounter, (or even an acknowledgment that the planet feels familiar) even though the conversation about it was so recent. Is there a narrative about the first Gundark encounter, where they fell into a nest of them? Where was it? Anything in Jedi Quest or Approaching Storm, maybe? In summary, Canon or Legends, it doesn't matter. Its all Star Wars and even Canon has its errors, I guess.
I think this Jedi Quest story: http://starwars.wikia.com/wiki/Jedi_Quest:_The_Moment_of_Truth was created for the AOTC comment (As in, the author had watched AOTC and wanted to build a book around that particular Noodle Incident, so they put it into their ongoing series.)
Ah, I see. Still would have made more sense, if they had at least acknowledged in The Clone Wars that they had been to Vanqor before. At least Jedi Quest stuck to the continuity of the Gundarks home planet.
There are also some Gundarks in The Disappeared Part II, not set on Vanquor, though they might have been imported.
Looked at from another way - maybe Jedi Quest introduced the concept that "Gundarks live on Vanqor" since that was the first appearance of the planet, in 2003. http://starwars.wikia.com/wiki/Vanqor/Legends
That is the reference to their earlier encounter. Why else would they know that gundarks are only found on Vanqor?