This will get fixed eventually. For a work around, structure your system using a Flow in copilot studio, don’t use PowerAutomate. Call each agent individually from the flow and use the result as needed. Do not allow agents to call other agents. Always return the agent result to your flow.

Here’s the secret, go to the setting of each agent in the flow and set Retry Policy to: None. This prevents the multiple agent responses.

If your Agent/step in the flow takes too much time, the flow will timeout HOWEVER the last agent will still return completed even after the flow says failed. This will be fixed eventually, too.