GDI_M060 Interface does not implement itself

[salmelo]

The following code

[Host]
public partial class StateManager : Node, ICombatState
{
    //[Provide(ExposedTypes = [typeof(ICombatState)])]
    [Provide]
    public ICombatState Self => this;
    
    public override partial void _Notification(int what);
}

is giving me the following error: GDI_M060: [Provide] member 'Self' has exposed type 'ICombatState', but type 'ICombatState' does not implement it. The error is the same regardless which version of the attribute used.