Maybe not, but it clearly happened in most polls conducted before the actual election. You can even see its effect in your posts, and Roydo's #715 above in which Corbyn is a candidate for "Most useless Labour leader ever" (as if Ramsay Macdonald, Michael Foot, Kinnock, Gordon Brown or Ed Miliband didn't exist).
Did it though?
https://www.bbc.co.uk/news/election-2017-39856354
It ended up being closer than the polls said, sure, but all of them showed Corbyn/Labour on an upward trajectory and, as you can see from that link, a poll on 31 May showed the Tories short of a majority. The direction of travel was all positive for Labour - it was just the extent of it that was off.
As for "most useless Labour leader ever", he clearly isn't - the GE performance alone got rid of that possibility immediately. But that's not saying he's a good one.