It is strange that the only building that can be built without the bug stopping you is the workshop.
But, I've got a work around that might just give you carpal tunnel but it does let you play the game almost normally
(Hotkeys still don't work everything has to be done with clicks)
You can place new buildings next to already built buildings so you can do 1 of two things if you can't build a workshop next to the point you want to build on:
1 start a barricade line over to the spot and have them be immediately torn down OR
2 build snipers/stockpiles to the spot and then immediately destroy and workshop over them
Damn... this one ALMOST works again.
The game loads and can start the campaign and random maps, which it couldn't do a month ago last time I checked
but huge swaths of every map are "dead" tiles that you just can't place anything on. you can beat some random maps even with this, but it also just ignores many of your other inputs.
 "Shattered Colony: The Survivors"){kind=icon}