To my surprise that system had the 'execve() wrapper and logger' package snoopy version 2.4.6-3 installed. Purging snoopy fixes the problem and installing it makes it come back - reproducibly.
Maybe this bug should be reassigned to package snoopy. (I still would like to test this on another machine.) -richy. -- Richard B. Kreckel <https://in.terlu.de/~kreckel/>
