TEST-74-AUX-UTILS has a number of subtests. test/units/TEST-74-AUX-UTILS.capsule.sh runs first and starts and stops capsule@foobar.service. Looking at the test, the unit is cleanly stopped. But later test/units/TEST-74-AUX-UTILS.machine-id-setup.sh tests for failed units. capsule@foobar.service is listed as failed, causing the second subtest to fail. Add the same test in test/units/TEST-74-AUX-UTILS.capsule.sh to see if the failed test really originates from there.