Inserting a delay is crude but I didn't have any better idea.
1 patch for repository http://darcs.net/screened:
patch 3bdf5623f8f673bbe6e8835d19fbb0513619447c
Author: Ben Franksen <ben.franksen@online.de>
Date: Fri Dec 18 13:07:49 CET 2020
* tests/network/clone-http-packed-detect.sh: fix spurious failures on MacOS