Why after leapp upgrade and reboot system fails with "Error: Some packages have invalid cache, but cannot be downloaded due to "--cacheonly" option" error?

Issue

• Leapp upgrade from RHEL 7 to RHEL 8 failed during reboot phase and system dropped into emergency mode with below error:

  Jun 20 08:30:00 localhost upgrade[596]:     Stderr: Warning: Package marked by Leapp to upgrade not found in repositories metadata: python2-leapp leapp-upgrade-el7toel8 leapp gpg-pubkey
  Jun 20 08:30:00 localhost upgrade[596]:             Error opening /var/cache/dnf/rhel-8-for-x86_64-baseos-rpms-376be2e46c653146/packages/bzip2-1.0.6-26.el8.x86_64.rpm: No such file or directory
  Jun 20 08:30:00 localhost upgrade[596]:             Package "bzip2-1.0.6-26.el8.x86_64" from repository "rhel-8-for-x86_64-baseos-rpms" has incorrect checksum
  Jun 20 08:30:01 localhost upgrade[596]:             Error opening /var/cache/dnf/rhel-8-for-x86_64-baseos-rpms-376be2e46c653146/packages/sos-4.7.1-2.el8_10.noarch.rpm: No such file or directory
  Jun 20 08:30:01 localhost upgrade[596]:             Package "sos-4.7.1-2.el8_10.noarch" from repository "rhel-8-for-x86_64-baseos-rpms" has incorrect checksum
  Jun 20 08:30:01 localhost upgrade[596]:             Error: Some packages have invalid cache, but cannot be downloaded due to "--cacheonly" option