15beta1 test failure on mips in isolation/expected/stats

Debian unstable mips (the old 32-bit one):

test vacuum-conflict              ... ok         2170 ms
test vacuum-skip-locked           ... ok         2445 ms
test stats                        ... FAILED    38898 ms
test horizons                     ... ok         4543 ms
test predicate-hash               ... ok        22419 ms

******** build/src/test/isolation/output_iso/regression.diffs ********
diff -U3 /<<PKGBUILDDIR>>/src/test/isolation/expected/stats.out
/<<PKGBUILDDIR>>/build/src/test/isolation/output_iso/results/stats.out
--- /<<PKGBUILDDIR>>/src/test/isolation/expected/stats.out    2022-05-16 21:10:42.000000000 +0000
+++ /<<PKGBUILDDIR>>/build/src/test/isolation/output_iso/results/stats.out    2022-05-18 23:26:56.573000536 +0000
@@ -2854,7 +2854,7 @@

 seq_scan|seq_tup_read|n_tup_ins|n_tup_upd|n_tup_del|n_live_tup|n_dead_tup|vacuum_count
 --------+------------+---------+---------+---------+----------+----------+------------
-       3|           9|        5|        1|        0|         1|         1|           0
+       3|           9|        5|        1|        0|         4|         1|           0
 (1 row)

Full build log:
https://buildd.debian.org/status/fetch.php?pkg=postgresql-15&arch=mipsel&ver=15%7Ebeta1-1&stamp=1652916588&raw=0

(I'll try rescheduling this build as well, the last one took 4h before
it failed.)

Christoph