the flag "PET_MOUNTABLE" exists but also doesnt exist

[Grease-1]

so if you look at like any dog in the game it says that it has the flag "PET_MOUNTABLE", but upon checking the "flags" section, I can't find the "PET_MOUNTABLE" flag anywhere.

[nornagon]

looks like that's a monster_flag, which we don't support yet. thanks for the report.