Some Parameters are not read from Aspire Host User Secrets

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

I have Parameter "Parameters:account-email-smtp-username": "xxx@smtp-brevo.com" in AspireHost User Secrets, but when host is started Parameter is empty. Even after editing the Parameter in Aspire Dashboard and checking check box “Save to user secrets" after restarting host Parameter is empty again.
Other similar Parameter in AspireHost User Secrets are working fine.

### Expected Behavior

Parameter value will be taken from User Secrets.

### Steps To Reproduce

_No response_

### Exceptions (if any)

_No response_

### Aspire doctor output

Aspire Environment Check
========================

Aspire
✅ Aspire CLI version 13.4.2 (channel: stable)

AppHost
✅ AppHost version 13.4.2 (aspire/Wave.AppHost/Wave.AppHost.csproj)

.NET SDK
✅ .NET 10.0.300 installed (arm64)

Container Runtime
✅ Docker v29.4.0: running (auto-detected (default)) ← active

Environment
✅ HTTPS development certificate is trusted

Summary: 5 passed, 0 warnings, 0 failed

### Anything else?

_No response_