right-click on variable in mapped MLIL produces warning

[psifertex]

Right-clicking on any variable token in MMLIL produces four copies of the following warning:

[Default] Passed invalid function type

I suspect it's due to the check for whether Set User Variable Value should show. Which it does. But it also fails to do anything when selected, produces four more of the same warnings.

Is a regression introduced in 4.0 but not there in 3.5.