Trying to mimic the Support gradual fleetwide service component upgrades (MGDCTRS-172) I found out that the label used for filtering the resources is:

cos.bf2.org/operator.type=debezium-connector-operator

However, when assigning the managed connector to a different operator - as described in ADR00063 Connectors Migration doc - by changing the assignedOperator field in the ManagedConnector resource - this label doesn't change, so the connector is recreated using the same operator.

Either this value needs to change when assigning a different operator or a different annotation needs to be used: The values that are currently changed when changing the assignedOperator field are cos.bf2.org/connector.operator or cos.bf2.org/operator.owner