The ‘build’ icon hitbox on an ovoo blueprint is very small/awkard vs every other building blueprint. Your mouse has to be right on the bottom right corner it seems or you’ll just hit the stone and do nothing. It’s not as thought they need to restrict it to leave room for ‘mine stone’ command because Mongol villagers can’t even mine stone. Please fix this and make it similar to every other building blueprint? It wastes time sometimes.
To reproduce simply place an ovoo blueprint over a stone then try and select a villager and tell them to go and build that ovoo you’ll notice the ‘build’ hitbox is very small vs a house/barracks etc.