packages.debian.org >broken links for changelogs

bw <[email protected]>
Newsgroups gmane.linux.debian.devel.www
Message-ID <alpine.DEB.2.20.1903211122570.25757@localhost> 
Seems to happen because of security updates?

one example:
https://packages.debian.org/stretch/firefox-esr
https://metadata.ftp-master.debian.org/changelogs//main/f/firefox-esr/firefox-esr_60.6.0esr-1~deb9u1_changelog
>Not Found
>
>The requested URL 
>/changelogs/main/f/firefox-esr/firefox-esr_60.6.0esr-1~deb9u1_changelog 
>was not found on this server.
>Apache Server at metadata.ftp-master.debian.org Port 443
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