Worker AI
Workers overprioritise fortifying walls. They ignore impasse flags to continue fortifying walls.
Workers wont claim a shrine if there is sacred ground next to it. They can dig gold next to the shrine but they wont claim it even if you set a rally flag on it.
You cant build bridges on water, only molten bridges work.
I encountered all this problems playing skirmish vs AI on the map Border War
These are all working as intended