EnumToggleButtons on flag enums shows None (0) values as always on.

[mSkull001]

Using the EnumToggleButton on a flag enum with a 'None = 0' value will display the None button as always on.

[Flags]
public enum MyFlags
{
    None = 0,
    Windows64 = 1,
}

[EnumToggleButtons]
public MyFlags Flags;

This behaviour happens across all Unity versions.

[mSkull001]

Fixed the issue.