this is a known glitch that happens sometimes to all of the pokken mons. If you need to know how to recover it lmk, but yes afaik this is something that the devs will be addressing in the next 1.3 update. Until then unfortunately it will continue be bugged like this :33
This is the info from the discord about the next update:
It links to Rocket’s post here if you would like to know more about it :))