I’m running version 12.2.1 and the issue is that it is not possible to add several MySQL instances to the same MySQL server. As for example:
New backup job 1:
MySQL port: 3321
New backup job 2:
MySQL port: 3322
Both backup jobs will get the port of the last saved job,that is the issue, i.e. both job 1 and 2 will get the same portnumber in this case 3322 if backup job 2 was after backup job 1.