Hi Jean-François and welcome to MAAS discourse!
Based on your logs, I can see that the error is coming from this line:
File /snap/maas/28521/lib/python3.10/site-packages/provisioningserver/rackdservices/lease_socket_service.py, line 121, in processNotification
yield pause(wait, self.clock)
builtins.AttributeError: 'LeaseSocketService' object has no attribute 'clock'|
that was reported as a bug. The bug was fixed, and released for 3.3.5. The line in 3.3.5 changed self.clock for just clock.
Could you please run sudo snap restart maas?