Okay sticking to my old theory thag started as a joke where I mentioned that Chopper will be the only member of the strawhat pirates with two wanted posters eventually. The first one being the obvious frolicking Chopper cotton candy eating pet. And when the world finally come to terms with his monster form the world gov will be like oh shiet! The Strawhats got some kind of new monster zoan crewmember! And thus a new bounty poster with a more accurate threat level bounty is born not knowing that is actually the cotton candy eating pet tanuki. Thus there will be 2 wanted posters.
Now let me twist that just a little to make it work SOMEWHAT LOOSELY with the "chopper will die in wano" theory:
As always there will be big bossfights by the time of Wano's end but this time Chopper gets KOed and then reappear as monster chopper. If the marines are there to see it, they will "kill" the old poster to make a more accurate one kind of resulting in chopper's death but reborn as a monster on the poster and of course, the pet is reported as dead.