Assignment box label changed unexpectedly after flow is updated.

The "label" refer to "pyTaskID" in the flow XML file, e.g.:

<pxLinkedRefTo>Approve - AAA</pxLinkedRefTo>

...

<pyTaskID>Assignment1</pyTaskID>

If the flow is updated (add/delete some other boxes in the flow), the label may change (e.g. changed to Assignment3).

This is unexpectedly. After the change is deployed, the existing assignment "Approve - AAA" open fail because the original label Assignment1 can not be found.

error msg:

The task with label ' Assignment1 ' and id ' Approve - AAA ' could not be found in this flow

We have to delete and rebuild assignment.

Any solution to avoid this?

BTW, image fail to upload here now. Upload stop when 99%.