PI Migration - Odd behaviour with Guest task

[madhurrya]

In this model https://mysql.spiffcrm.com/process-models/misc:qa:bpmn-model-testing:composite-test-model-with-all-elements
when I complete this guest task it looks like this.

Even after I complete some other tasks of the current call activity it looks the same. But now if I do a migration in that call activity and check the instance, that guest task has turned yellow.

e.g https://mysql.spiffcrm.com/i/30
https://mysql.spiffcrm.com/i/29

This is such completed instance
https://mysql.spiffcrm.com/i/28

I tried with this simple model, but couldn't recreate it.
https://mysql.spiffcrm.com/process-models/misc:qa:madhu-testing:guest-user-task

[jasquat]

I was not able to replicate with a simpler model like: start -> manual -> timer -> guest manual -> call activity -> end.

I completed the guest task and then changed a name of a task inside the call activity and migrated but still it didn't replicate. I'm not sure what it is about @madhurrya's model that would do this.