When I loaded up my game this evening, I found that all of my plants had separated from their pots/farm tiles. The pots' and tiles' status showed "no seed selected." The Wheezeworts all had a strange icon in their requirements section (see attachment).
Everything still seemed to be in the right location, just not "in" their holders.
I looked for a OxygenNotIncluded_Data\output_log.txt file but could not find it at the location described below.
This was a new world created with the preview branch. It's ~180 cycles old. I haven't seen this happen before, and I don't know how to reliably recreate the situation.