Update failure with "failed to commit transaction (invalid or corrupted package)"

The deprecated option SyncFirst has not been available since April 2024. Including it in /etc/pacman.conf will just result in an error message:

run0 pacman -Syu
warning: config file /etc/pacman.conf, line 19: directive ‘SyncFirst’ in section ‘options’ not recognized.
:: Synchronizing package databases…
core is up to date
extra is up to date
:: Starting full system upgrade…
there is nothing to do

A previous forum post regarding this:

And the Manjaro commit made in April:

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