V2 tilesets are brocken (SDL2 issue and not only)
First they can't be loaded. You should select tileset in main menu, turn off the game, go to ~/.config/goblin-camp/config.py
change useTileset
and run the game again. Then it will crash! ;-)
It crashes is because of moving to SDL2 (I've been hacking and slashing to make it build with SDL2 without fully understanding what I am doing). You can try https://gitlab.com/dhyannataraj/goblin-camp/-/tree/last_commit_with_sdl1_supported there tilesets will work (if you do as said above) but there would be problems with fitting the viewport. May be because of the changes of default.png size... I do not know.
But this all should be fixed.