produces "trunc does not exist" (user did not provide cut-and-paste error, sorry.)
Works on 3.21.1-1.pgdg110+1 , does not work on 3.22.0-1.pgdg110+1
It is expected
In older releases some functions from orafce extension was in public or pg_catalog schema. It was pretty dirty. Now, all functions are in schema oracle.