Blazor HeadOutlet rendering creates blank intermediate states

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

I use `` to insert `` tags into the head to include dynamic stylesheets
when i go from one HeadContent containing
` `
to another HeadContent containing
` `
there is an intermediate state being rendered by the browser where the headcontent is empty (or rather, maybe, during the replacement of the `` tag in the header)

here's a video of how this looks. the red flashes at like second 4 are static fallbacks to a backgroundcolor - and they are the problem:

https://github.com/user-attachments/assets/084951bf-9332-41ae-a8a7-d074d57ed275

i'm gonna upload the repro solution soon, and link to it, a little later.

this even happens if the both HeadContents are outputting the same html fragments, which definitely shouldn't be the case.

### Expected Behavior

the rendering of the head outlet should happen without an intermediate indeterminate state

### Steps To Reproduce

i'm gonna upload the repro solution soon, and link to it, a little later.

### Exceptions (if any)

_No response_

### .NET Version

10.0.7

### Anything else?

i'm using current edge to show the problem, but it happens on other browsers, too.