acc(mouse) returning no value in Windows Build 16215

[_pi]

In Windows 10 Insider Preview Build 16215 in windows explorer acc(mouse) is returning no value when clicking on a file.
Usuually when i get no value i send key AU for navigating up in folder hierchay (click in empty space)

Function left_explorer

Code:

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Acc m=acc(mouse)

str name=m.Value
out name