/var/log/postgresql/pg_upgradecluster-14-15-main.<random> directory is empty

23 19:11 <ilmari> Myon: I just tried pg_upgradecluster from 14 to 15, and it failed because of missing loadable 
                  libraries, but the /var/log/postgresql/pg_upgradecluster-14-15-main.<random> directory is 
                  empty
23 19:21 <ilmari> (and /var/lib/postgresql/15/main/ with its pg_upgrade_output.d is gone)
23 19:21 <ilmari> using postgresql-common 241.pgdg110+1