Bug in Microsoft Flow when using “Ask in PowerApps”

When altering an existing Flow which is initiated by a PowerApp actions, there is a somehow clever build in feature for generating an input scheme.

Case

1. Create a flow which is initiated by an action in PowerApps.
2. Create “action 1" with a dynamic “Ask in PowerApps” parameter
3. Create “action 2” and refer to the parameter from Step 1
4. Wait a few months
5. Alter the flow by removing “action 1”
6. Run flow again, it fails

Let me show you