I think it is the zero conditional, of which the following is an example.
The zero conditional only works with habits and facts especially scientific ones.
I think 'had happened' should have been used because it is a third conditional unless the writer did not know whether it had actually happened. Given the context, it is unlikely that the writer did not know.
So have you known now the reason for the confusion I am in.
That proves that what I told you was right. I have told you that the past simple can unnaturally be used instead of the past perfect, which denotes an irrealis past situation, in the existence of another past action.
When I give more really used examples, you will be sure of what I mean. I did not say I am for this usage; I only said it does exist, but you did not believe me!
I agree. That sentence is incorrect.
That's what I also said. I literally said, "you can consider it a hyper-correct mistake."
I observe that man of manners has posted the same question for the consideration of the good folk on the
WordReference forum.
Maybe he expects to get different answers there.
There is no shame to ask my question on different sites. It is also not an indicator of dissatisfaction. I just need more opinions and need to know how the folk, as you call them, feel about such a sentence. I appreciate all your answers very much and they are really very helpful to me, but I can't find a good reason for not posting my question even everywhere. It is not a matter of exclusiveness. I will keep visiting all my threads daily and respond to any posts. Starting a new thread anywhere will not affect my ordinary activities.