Validation error after adding a second agent loop

### Severity

P1 - Critical (Blocking production)

### Describe the Bug with repro steps

Description:
When I add a second agent to my workflow, and I try to save the workflow, an error message is presented with an internal server error. When I save the flow with a single agent, nothing goes wrong.

Expected behaviour:
A second agent is added to the workflow and the flow is saved as usual.

Actual behaviour:
An error message is presented with no additional information and the workflow is not saved.

Error message:
Workflow validation failed for the workflow 'NAME-WORKFLOW'. {"Code":"BadRequest","Message":"Encountered an error (InternalServerError) from host runtime.","Target":null,"Details":[{"Message":"Encountered an error (InternalServerError) from host runtime."},{"Code":"BadRequest"},{"ErrorEntity":{"Code":"BadRequest","Message":"Encountered an error (InternalServerError) from host runtime."}}],"Innererror":null}

### What type of Logic App Is this happening in?

Standard (Portal)

### Are you experiencing a regression?

_No response_

### Which operating system are you using?

Windows

### Did you refer to the TSG before filing this issue? https://aka.ms/lauxtsg

Yes

### Workflow JSON

```json

```

### Screenshots or Videos

_No response_

### Environment

Chrome Version 137.0.7151.104 (Official Build) (64-bit)

### Additional context

_No response_