It has Cobblestone symbol, so can only be built on Cobblestone.

For buildings that require clearing/cobblestone, I've always been able to place them on grass, and then it just tacks on another day of construction to include putting down the right ground.

Try building the cobblestone. I'm confident that this will be the reason.

No, the problem is that the meeting point building is social, not leisure.

Originally posted by DsnowMan:

No, the problem is that the meeting point building is social, not leisure.

The two Shared Tables two squares left are Leisure.

Oops. Didn't see those when I zoomed into the picture.
Try building cobblestone paving first

I finished this run, so I unfortunately can't try placing the cobblestone. I'll try building cobblestone first if I run into the issue again though!

Hmmm... That's very strange, I tried to recreate the same situation, and it lets me build it. I wonder if you had some buildings become abandoned the turn before, and maybe that messed up the logic? Did you try reloading the game to see whether that was solved?

What makes a building abandoned? I don't think I've had it happen before, but I don't think I ever used the gathering table 2 tiles away. There was a strange grass texture on that tile, which is a bit hard to see in the photo. I haven't played much, but I don't think it looks like an old farmed tile. I don't recall if I ever tried to dismantle anything on that tile.

Buildings become abandoned when their requirements are not met anymore, but it does not seem like that happened here