Archived 5.15 docs are missing functions in some classes

While checking the now archived Qt 5.15 docs, I realized that QFile is missing both exists() (public and static) functions, although cited throughout the whole page.

They are there for other earlier archived versions, and they were there before archiving, as shown in wayback machine.

The static function obviously exists (pun intended?) for that version as well, along with its overload.

Another case I just found: the QElapsedTimer documentation is missing everything related to functions.

At this point, it seems clear that the issue involves many more classes. I realize that Qt 5.15 is not supported anymore, but it makes little sense to have archived documentation if it's incomplete and inconsistent.