With the mod installed space platform foundations become impossible to remove. You just get a red x if you use the deconstructor planner and right click with foundation on the cursor does nothing.
Narrowed it down to this. No other mods running except the base mods.
Also, after the recent (mod) update you can now 1) place space platform foundations (SPF) without any adjacent SPF and 2) form a doughnut with SPF. Both should not be allowed.
Sorry, I've reverted that bit for now. I believe that's a bug with Factorio, so I'll open a bug report there, and wait until a resolution on that before proceeding again.
Wube has recognized the issue, but likely will not fix it because it does not crash the game. I've found another way to do what I need to do without causing this issue.