Can't spawn more than one Sacred Grove

Hi
I am using the harvest scarabs + harvest map device craft + tree for harvest and still can't spawn more then one sacred grove per map.

If this is intended mechanic or limitation of the system, it should be clearly indicated in the game. I can't find this info on the scarab, on the map device or on the atlas. If this is known limitation, why can I add the map device craft with the scarab? It should be blocked if the game knows its useless.

I would happily argue that that is not clear enough for an average player.