I've created four different garden plots on Central US-02 (1pp) Experimental in very different locations (near a town, in the woods, in a field).

It creates the garden, but then when I try to prepare the first slot for planting, the whole garden disappears and I get an error saying there are no available slots.

I also tried creating a plot and *NOT* preparing the first slot. The garden still disappears after a few seconds. Usually 5 seconds or so.

I'm using a Pristine Farming Hoe.
It's also raining quite a bit (constantly), so I was trying to take advantage of that. (But maybe some new mechanics have been added to wash away the garden?)

(I'm not sure which 0.58 update this is, or how to tell, but it occurred on 8/1/2015, after the 7/31/2015 update.)