Hi Alex,
I think I have found another bug. My “Edit” form has 15 text column and 14 lookup columns.
Process
1) Create a new item and select somethihg for the lookup – (OK)
2) Edit the item and REMOVE the lookup choice (seems OK)
3) Re-Edit the item. The removed lookup choice reappears.
In my form it is therefore not possible to REMOVE a lookup after it has been selected