Confirmed and fixed. The pet frames were fetched straight from the MSU CDN, which refuses (403) part of its Item/Pet tree - I probed it: 5000047 Robo, 5000053 Gorilla Robo and 5000102 all 403, while 5000000 and 5000012 serve fine. So those pets loaded a name tag and no sprite, exactly as you saw. Pet art now goes through the same three-tier chain as everything else (MSU -> cdn.mapleverse.online -> maplestory.io); our own mirror has all of them.

This also removes most of the red console spam in #4.

(On the dev branch - it will be in the next published build, not v32.)