2.03, but the changelog doesn't mention the problem so it's probably still there:

Twice now on Gleba I've found it obsessed with a location, the beam hits it repeatedly but nothing happens so next cycle it's still there to do. Both involved shift-placed stuff, both had some bit of environment to pick up before placement was possible. The first time it was pickup/landfill/substation, the second was pickup/soil. Both were cleared by manually harvesting the offending object. I'm thinking perhaps it's out of order and trying to place before it picks up.

Update: This is only partially your bug. I can reproduce it without the turrets being involved. The game (probably base, but I haven't ruled out other mods) simply doesn't place the soil under something that's in the way. But the turrets obsess over it rather than just skipping it.

More observations:

If I fail to order deconstruction of the junk the game will fail to clear the trash out of the water and thus fail to place. If I do order the deconstruction first the personal bots do correctly handle it, the turrets are prone to getting stuck. If I have ordered the deconstruction my bots will fix the problem that is sticking the turrets. I see no reason to think it's Gleba-specific, but rather that Gleba is where you find trash in the water.

I think the problem is worse on Aquilo, the turret keeps trying to place concrete at a location that needs ice first. Burning though concrete quickly, which is hard enough to transport out to Aquilo in the first place.

Ouch!! I thought it was just getting in a loop failing to place it, I didn't realize it was consuming the supplies. Everything I've hit on Gleba I had tons of, if some was getting consumed without being placed it wouldn't have been apparent.