002_pg_upgrade is broken for custom install

Hi All,
When oldinstall and olddump environment variables are set,
002_pg_upgrade.pl test does not finish and fails.
# initializing database system by running initdb
ok 1 - check locales in original cluster
ok 2 - loaded old dump file
# initializing database system by running initdb
ok 3 # skip source node not using default install
ok 4 - dump before running pg_upgrade
# test failed
stderr:
# Tests were run but no plan was declared and done_testing() was not seen.
# Looks like your test exited with 29 just after 4.

Doesn't look like it's expected.

Even if I rollback the history as far as
f52345995d3691de7b0a888903b6cfed1497c672, the failure still appears.
IIRC, the test was working fine till October 2024. But I might be
wrong. Don't have energy to try git blame right now, but might do once
I get some time.

--
Best Wishes,
Ashutosh Bapat