[Blazor] Enhanced navigation streaming issue

There seems to be a bug with enhanced navigation and streaming rendering where at some point it seems that we are overriding a buffer. We know because the descriptor doesn't start with the expected data protection magic header payload `CfDJ`

<img width="2710" height="228" alt="Image" src="https://github.com/user-attachments/assets/df8af00c-bf66-4062-ba23-93eaed4038f6" />