When splitting a conductor with an open device, the feederIDs for the two new conductors may not be updated correctly if the 'Enabled' field is set to 'False'.
This will occur if Feeder Manager is configured to respect the Enabled field when tracing.
This issue may be related to the following bug resolved in ArcFM 10.0.3.
MM44464: Feeder Manager -- Feeder Manager autoupdaters may not properly update FeederID or ParentCircuitSourceID when configured to respect Enabled field.
Place the open device with the Enabled field set to True, and then toggle the value to False.