I want to activate activity manually in the workflow instance

[vivek-outamation]

Issue Description

I am working with a workflow scenario where activities are event-type activities.

Initial workflow definition:

A -> B

Workflow instance is created.

Activity A is triggered and completed.

Activity B is now active.

Later, I update the workflow definition to:

A -> B
  -> C

Here, C is a newly added event-type activity running in parallel with B.

I then run alteration (migration) to update the running instance to the latest version.
The alteration succeeds without errors.

Problem

After migration, activity C is not being activated automatically.

For my use case, I need the newly added event activity (C) to be activated as part of the alteration, even though the instance was already running before the workflow change.

Question

Is this possible with the existing functionality of alterations?

If not, what is the recommended way to achieve this behavior?

My goal is that when I add a new event activity in parallel to an already running one, alteration should also activate it in the running workflow instance.