Yes, exactly.
issue is provided by the filesystem package, which was just updated.
It comes from upstream Arch, so it’s set to display the version of Arch that is installed.
You’re using EndeavourOS, though, so Endeavour has its own issue file that displays the version of the system labeled as EndeavourOS, not Arch Linux.
The pacnew was generated because the issue file on your system does not match the default upstream issue file.
In this case, you should ignore the pacnew and keep the Endeavour issue file.