q3map2 png bug reproduceable

git clone https://github.com/InterstellarOasis/map-rsmse_src.dpkdir.git
cd map-rsmse_src.dpkdir
q3map2 -fs_pakpath . -bsp -game tremulous -meta -custinfoparms maps/rsmse.map
q3map2 -fs_pakpath . -vis -game tremulous -fast -saveprt maps/rsmse.bsp
q3map2 -fs_pakpath . -light -game tremulous -fast -shade -dirty -patchshadows -samples 1 -samplesize 8 -bouncegrid -bounce 1 -lightmapsize 1024 -external maps/rsmse.bsp