Rabbitqm repeatedly stopped unexpectedly with code 0

In test run https://solutions.qa.canonical.com/testruns/36d438ef-d53a-4801-80df-a85597114280/ (microstack 2023.1 candidate, jammym, singe-node), the test run fails because the rabbitmq unit is stuck waiting with status "Waiting for leader to create operator user". In the rabbitmq pod logs we see the following message repeated:

================
2023-08-31T18:15:53.538Z [pebble] Service "rabbitmq" stopped unexpectedly with code 0
2023-08-31T18:15:53.538Z [pebble] Service "rabbitmq" on-success action is "restart", waiting ~500ms before restart (backoff 1)
2023-08-31T18:15:54.079Z [pebble] Service "rabbitmq" starting: rabbitmq-server
2023-08-31T18:15:55.363Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** got ALIVE2_REQ
2023-08-31T18:15:55.363Z [epmd] epmd: Thu Aug 31 18:15:55 2023: registering 'epmd-starter-167649463:1693504589', port 34673
2023-08-31T18:15:55.363Z [epmd] epmd: Thu Aug 31 18:15:55 2023: type 77 proto 0 highvsn 6 lowvsn 5
2023-08-31T18:15:55.363Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** sent ALIVE2_RESP for "epmd-starter-167649463"
2023-08-31T18:15:55.376Z [epmd] epmd: Thu Aug 31 18:15:55 2023: unregistering 'epmd-starter-167649463:1693504589', port 34673
2023-08-31T18:15:55.415Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** got ALIVE2_REQ
2023-08-31T18:15:55.415Z [epmd] epmd: Thu Aug 31 18:15:55 2023: registering 'rabbit_prelaunch_1036:1693504979', port 25672
2023-08-31T18:15:55.415Z [epmd] epmd: Thu Aug 31 18:15:55 2023: type 77 proto 0 highvsn 6 lowvsn 5
2023-08-31T18:15:55.416Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** sent ALIVE2_RESP for "rabbit_prelaunch_1036"
2023-08-31T18:15:55.423Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** got NAMES_REQ
2023-08-31T18:15:55.424Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** sent NAMES_RESP
2023-08-31T18:15:55.424Z [epmd] epmd: Thu Aug 31 18:15:55 2023: unregistering 'rabbit_prelaunch_1036:1693504979', port 25672
2023-08-31T18:15:55.425Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** got ALIVE2_REQ
2023-08-31T18:15:55.425Z [epmd] epmd: Thu Aug 31 18:15:55 2023: reusing slot with same name 'rabbit'
2023-08-31T18:15:55.425Z [epmd] epmd: Thu Aug 31 18:15:55 2023: registering 'rabbit:1693504592', port 25672
2023-08-31T18:15:55.425Z [epmd] epmd: Thu Aug 31 18:15:55 2023: type 77 proto 0 highvsn 6 lowvsn 5
2023-08-31T18:15:55.425Z [epmd] epmd: Thu Aug 31 18:15:55 2023: ** sent ALIVE2_RESP for "rabbit"
2023-08-31T18:22:20.030Z [epmd] epmd: Thu Aug 31 18:22:20 2023: unregistering 'rabbit:1693504592', port 25672
2023-08-31T18:22:21.758Z [pebble] Service "rabbitmq" stopped unexpectedly with code 0
2023-08-31T18:22:21.758Z [pebble] Service "rabbitmq" on-success action is "restart", waiting ~500ms before restart (backoff 1)
2023-08-31T18:22:22.267Z [pebble] Service "rabbitmq" starting: rabbitmq-server
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I haven't found the rabbitmq logs, so I can't dig much deeper.

Logs and configs can be found here: https://oil-jenkins.canonical.com/artifacts/36d438ef-d53a-4801-80df-a85597114280/index.html