Correct or wrong?: "When I will meet him, I will explain."

Question

Background

I think the present simple is usually used after when if it's like a condition.

E.g.:

I'll call you when I arrive. (correct)
I'll call you when I will arrive. (wrong)

However, on english-corpora.org, I found a sentence in which an expression like a wrong example above is used:

When I will meet him, I will explain.

Question

Is the sentence I found correct or wrong? If it's correct, why?

Answer 1

It‘s wrong.

I‘m pretty sure it was just a typo, because as far as I see there is no reason this rule wouldn‘t apply in this case.

It should be “When I meet him, I will explain”