When we have several MSOB resources and we delete the MOSC resource, not all MOSB resources are garbage colledted. After deleting the MOSC resource we can see that there are MOSB resource that were not deleted.

4.17 

Always

1. Enable techpreview
2. Create a MOSC resource
3. Wait for the image to be built and applied
3. Create a new MC (any MC) so that we build a new image and a new MOSB resource is created
4. Wait for the image to be built and applied
5. Remove the MOSC resource

We have this initial scenario

$ oc get machineosconfig
NAME     AGE
worker   79m

$ oc get machineosbuild
NAME                                                              PREPARED   BUILDING   SUCCEEDED   INTERRUPTED   FAILED
worker-rendered-worker-269adf05864ad9d63d7954781af64f0b-builder   False      False      True        False         False
worker-rendered-worker-85efffa30bf41b4071acea2242099603-builder   False      False      True        False         False


When we remove the the MOSC resource we get this final scenario

$ oc get machineosconfig
No resources found

$ oc get machineosbuild
NAME                                                              PREPARED   BUILDING   SUCCEEDED   INTERRUPTED   FAILED
worker-rendered-worker-269adf05864ad9d63d7954781af64f0b-builder   False      False      True        False         False

Only one MOSB resource was garbage collected.

All machineosbuild resources should be garbage collected when we remove a machineosconfig resource