Package Tracking entries might go missing after save under certain conditions

[Dan-Peck]

Summary

Package Tracking block may lose one or more entries when editing an existing package tracking block that has had manually removed entries.

To reproduce

• Create package tracking block
• Add a few tracking numbers
• Save
• Edit the tracking block
• Remove the first tracking number
• Save
• Edit the tracking block
• Add a new tracking number
• Save
• Notice one of the tracking numbers that were saved is now missing

Workaround

• Delete and re-create the Package Tracking block rather than editing an existing one.

Dev Notes

• Re-sequencing and/or syncing of tracker indexes with the modal will be necessary to prevent this scenario

[Dan-Peck]

Merged in @ 50b2ddb and added to the queue for upcoming release to the live site.