Accept-Encoding Header Mismatch Between Real Request and Worker

### What versions & operating system are you using?

wrangler 4.33.2
System:
OS: Linux 6.14 Ubuntu 24.04.3 LTS 24.04.3 LTS (Noble Numbat)
Binaries:
Node: 24.6.0

### Please provide a link to a minimal reproduction

_No response_

### Describe the Bug

### Description
There is a discrepancy between the actual `Accept-Encoding` header sent by the client and what the application receives through the Cloudflare Worker.

### Expected Behavior
The application should receive the same `Accept-Encoding` header value that was originally sent by the client.

### Actual Behavior
The `Accept-Encoding` header values differ across different sources:

- **Real Request (sent by client):** `Accept-Encoding: "gzip, deflate, br, zstd"`
- **Application Request (`req.headers()`):** `Accept-Encoding: "gzip, br"`
- **Local Server(wrangler dev) Cloudflare Context (`req.cf`):** `clientAcceptEncoding: "gzip, deflate, br, zstd"`
- **Remote Server Cloudflare Context (`req.cf`):** `clientAcceptEncoding: "gzip, deflate, br"`

### Similar Errors
cloudflare/workers-sdk#5246

### Please provide any relevant error logs

_No response_