OK, apparently the repository Packages.bz2 had not updated, but
Packages.gz and Packages had. It seems to have been fixed now.
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https://bugs.launchpad.net/bugs/1864623
Title:
apt-get at
The cake is a lie.
--print-uris does *NOT* print the URIs an "apt update" is bound to use.
It can't because it doesn't download any file and it would need to
download at least the (current) InRelease file to answer that. So what
it does is print the URIs it would download IF everything would exist