In axelor-base module’s Selects.xml the classname for mail fetcher in meta.schedule.job.select is wrong. It is specified as:
com.axelor.mail.service.MailFetchJob
but the correct class name is:
com.axelor.apps.message.job.FetchEmailJob
If you try to edit the default mail fetch job schedule, nothing shows in the « Job » dropdown and saving the schedule clears the job (resulting in non-functional schedule).
Also if you try to create a new schedule to fetch mail, you can only select the wrong class name (there is no option to enter one manually). After the schedule is saved, it appears to run but does nothing as the class does not exist. Yet, no error message is ever logged.