It seems that the test case added by f5fc2f5b2 is still a bit unstable, even after c64dcc7fe:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=peripatus&dt=2021-04-23%2006%3A20%3A12 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=peripatus&dt=2021-04-24%2018%3A20%3A10 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=snapper&dt=2021-04-28%2017%3A53%3A14 (The snapper run fails to show regression.diffs, so it's not certain that it's the same failure as peripatus, but ...) regards, tom lane
