On 05/12/2025 03:00, Alexander V. Makartsev wrote:
As an experiment, I've switched apt sources from "deb.debian.org" to
"debian.netcologne.de" and everything went back to normal.
Please, report it as a bug unless those, who are running that mirror,
are aware and working on the issue and unless your ISP has aggressive
transparent HTTP proxy.
I expect that apt uses the mirror that may be obtained from
dig -t SRV _http._srv.deb.debian.org.
(see <https://deb.debian.org/>). Check modification time of Release and
Packages files in appropriate sections.