[Errno 256] No more mirrors to try

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This early morning I’ve received a related message from anacron:

/etc/cron.daily/0yum-daily.cron:
Some delta RPMs failed to download or rebuild. Retrying..

Right now, on a test machine, it is getting this (excerpts):

Some delta RPMs failed to download or rebuild. Retrying..
polkit-0.112-18.el7_6.1.x86_64 FAILED                                          
http://mirror.gadix.com/centos/7.6.1810/updates/x86_64/Packages/polkit-0.112-18.el7_6.1.x86_64.rpm: [Errno 14] HTTP Error 416 - Requested Range Not Satisfiable
Trying other mirror.

Error downloading packages:
  polkit-0.112-18.el7_6.1.x86_64: [Errno 256] No more mirrors to try.

Haven’t tried, but I guess the update will work by disabling deltarpms until CentOS repos are fixed.