Regression failure with PG17: fact_loader.worker retuns false

[df7cb]

Running against PG17:

**** regression.diffs ****
diff -U3 /home/myon/projects/postgresql/pg-fact-loader/pg-fact-loader/expected/16_1_2_features.out /home/myon/projects/postgresql/pg-fact-loader/pg-fact-loader/results/16_1_2_features.out
--- /home/myon/projects/postgresql/pg-fact-loader/pg-fact-loader/expected/16_1_2_features.out	2024-09-17 14:47:49.000000000 +0000
+++ /home/myon/projects/postgresql/pg-fact-loader/pg-fact-loader/results/16_1_2_features.out	2024-09-17 14:55:39.981286414 +0000
@@ -618,7 +618,7 @@
 SELECT fact_loader.worker();
  worker 
 --------
- t
+ f
 (1 row)
 
 --Does not show now
### End 17 installcheck (FAILED with exit code 1) ###

I've now muted the problem by effectively disabling that test in the Debian package, but that looks like it needs a proper solution.