Hello,
I stumbled over this bug.
Tests show, that the mentioned mirrors mirror.eu.oneandone.net and mirror.us.oneandone.net still work fine, despite the report from the OP.
No complains from apt or other package management tools.
However, maybe it would be good, to update the mirrors to IONOS nevertheless, like this:
(to be save for the future)
- Site: mirror.eu.oneandone.net
+ Site: eu.mirror.ionos.com
Country: DE Germany
Archive-architecture: amd64 arm64 armel armhf i386 loong64 mips64el mipsel ppc64el riscv64 s390x
Archive-http: /debian/
Archive-rsync: debian/
Old-http: /linux/distributions/debian/debian-archive/
Old-rsync: debian-archive/
- Sponsor: 1&1 Internet AG http://www.1und1.de/
+ Sponsor: IONOS https://www.ionos.de/
- Site: mirror.us.oneandone.net
+ Site: us.mirror.ionos.com
Country: US United States
Location: Lenexa, KS
Archive-architecture: amd64 arm64 armel armhf i386 loong64 mips64el mipsel ppc64el riscv64 s390x
Archive-http: /debian/
Archive-rsync: debian/
- Sponsor: 1&1 Internet http://1and1.com
+ Sponsor: IONOS https://www.ionos.com/
Holger