My keyring is broken (but not really)

Sadly no. It fails to import the arch key when I attempt the update.

$ sudo pacman -Su

:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Packages (2) archlinux-keyring-20210616-1  manjaro-keyring-20210622-1

Total Download Size:   1.07 MiB
Total Installed Size:  1.49 MiB
Net Upgrade Size:      0.01 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 archlinux-keyring-20210616-1-any          964.0 KiB   229 KiB/s 00:04 [########################################] 100%
 manjaro-keyring-20210622-1-any            126.6 KiB   278 KiB/s 00:00 [########################################] 100%
 Total (2/2)                              1090.7 KiB   228 KiB/s 00:05 [########################################] 100%
(2/2) checking keys in keyring                                         [########################################] 100%
downloading required keys...
:: Import PGP key 77193F152BDBE6A6, "Arch Linux ARM Build System <builder+n1@archlinuxarm.org>"? [Y/n] y
error: key "77193F152BDBE6A6" could not be looked up remotely
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.

I will try restoring the gnupg directory from snapshots.