Mouse click on button in widget component works in PIE but not in standalone

[Ysgrathe]

…And to update my particular situation:
I found a workaround

// I replaced this:
ActionButton->OnClicked.AddDynamic(this, &UActionItem::ButtonClicked);

// with this:
ActionButton->OnPressed.AddDynamic(this, &UActionItem::ButtonClicked);

So basically, I hooked the OnPressed event instead of the OnClick one.
That seems to have restored pretty much what I had working in PIE.