Why cant I Set/Update a MAP variable in Construction script?

Is there an unreported bug with CS not updating Vars, and UE4.27?? (Ive found many threads reporting this issue.)

In the older version, someone could even set a Var in CS without setting it to Instance Editable.

Yet in UE4.27, I cannot set a MAP or Array var in CS, when both are set to Instance Editable (which I believe they changed - that it is now required to be on. But still CS wont update my Map or Array vars???)