spoilers for season 2 of The Mandalorian
Okay, the question itself was a bit hard to phrase, but I'll try my best.
In Attack of the Clones, we first see Jango Fett using the same Mandalorian armor that Boba has in the original trilogy, showing that it was passed down from father to son. But when we meet the Mandalorians in The Clone Wars, they report that Jango is not one of them and obtained Mandalorian armor in some unknown way. This tracks, as Jango is a bounty hunter and has always worked on his own.
But, in season 2 of The Mandalorian, Boba Fett tells Din that Jango was a foundling and fought in the Mandalorian Civil Wars. If this is the case, why did Mandalore claim no connection to Jango in The Clone Wars? Is this just a total retcon of that line, or can both of the claims be true?