Switching a non-interrupting start event to an interrupting one within a subprocess is not supported.

[nowitz]

Describe the Bug

If I have a Start Event in a subprocess and set it to a Message Start Event, I can switch it to a non-interrupting Message Start Event. However, switching it back to the interrupting variant is not possible directly. To revert the change, I must either select a completely different event type first or use the toggle button in the upper-right corner, as shown in the screenshot.

Steps to Reproduce

1. Create a subprocess.
2. Add a Start Event inside the subprocess.
3. Change the Start Event to a Message Start Event.
4. Switch it to a non-interrupting Message Start Event.
5. Try to switch it back to the interrupting variant.

Expected Behavior

To change the event type, both after clicking on the event type selection and through the button in the upper right corner.

Environment

Browser: Any
OS: Any
Library version: v18.6.1

[barmac]

I can reproduce the issue. We can move to a non-interrupting variant, but not back.

Thank you for your report.