Latest commit (the automatic merge commit created by GitHub) is this one and it has 14 build results uploaded as I write this. But the PR specific file view of io.c appears to still be bogus, albeit in a different way (it now has both red and green lines, but they cover a seemingly random subset of lines). While the commit specific file view of io.c seems fine (well, modulo the issue I describe in another post).
I note that one is on the app. subdomain of codecov, the other on the top domain, so maybe this is a matter of the new versus old website code?