C++ bitmask enums appear to be offset by 1

Development Programming & Scripting
12

As per UE-32816,

This is actually as-designed behavior - the enum values are currently assumed to be flag indices and not actual flag mask values. That is, the editor will compute (1 << N) where N is the value of the enum. This is consistent with how user-defined enums work on the editor side. Can see how it would be useful to be able to designate native C++ enums as literal mask values though, especially when used alongside ENUM_CLASS_FLAGS().

Fortunately, to get the OP’s desired behaviour all you have since UE-32816 is add the following to the top of your enum declaration:

UENUM(BlueprintType, meta = (Bitflags, UseEnumValuesAsMaskValuesInEditor="true"))
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