I took me a while to notice this, but moving around my initial base I noticed some of my sorters were missing, so replaced them and went about doing things only to come back later and notice all four of my sorters were missing. I thought maybe it was a distance issue, so moved a way to my research area and was zoomed out. Moved around a bit, pushed them off my view area and walked back. Everything seemed fine, until I heard the sound of research complete while watching my sorters disappear.
I'm not sure if there's some weird compatibility thing going on where the technology is getting removed, and readded at each research completion, thus making them not valid placements or something? I have Auto Research, but I already disabled it and I still get the same issue, so It's not that.
