I have updated the mirrorlist twice with reflector-simple and different parameters each time. Didn’t have this problem this morning.
[csaba@csaba-mini ~]$ yay
:: Synchronizing package databases...
endeavouros is up to date
core is up to date
extra is up to date
multilib is up to date
error: failed retrieving file 'extra.db' from mirror.telepoint.bg : The requested URL returned error: 404
error: failed retrieving file 'extra.db' from mirrors.uni-plovdiv.net : The requested URL returned error: 404
:: Starting full system upgrade...
warning: grub: ignoring package upgrade (2:2.06.r566.g857af0e17-1 => 2:2.12rc1-1)
resolving dependencies...
looking for conflicting packages...
Package (1) Old Version New Version Net Change Download Size
extra/virtiofsd 1.7.2-1 1.8.0-1 0.06 MiB 0.80 MiB
Total Download Size: 0.80 MiB
Total Installed Size: 2.19 MiB
Net Upgrade Size: 0.06 MiB
I just had the same problem, after I updated the mirrors with the welcome app (Arch, rate-mirrors), the problem was solved.
[pycrk@eno ~]$ LANG=C yay
:: Synchronizing package databases...
endeavouros is up to date
core is up to date
extra is up to date
multilib is up to date
error: failed retrieving file 'extra.db' from mirror.moson.org : The requested URL returned error: 404
error: failed retrieving file 'extra.db' from archmirror.it : The requested URL returned error: 404
:: Searching AUR for updates...
:: Searching databases for updates...
there is nothing to do
[pycrk@eno ~]$ LANG=C yay
:: Synchronizing package databases...
endeavouros is up to date
core is up to date
extra is up to date
multilib is up to date
:: Searching AUR for updates...
:: Searching databases for updates...
there is nothing to do