Start Streaming logs displays repeated "NUL" characters for Linux deployment slot after swap

[v-ruizh]

OS: Win 11 x64
Build Version: 20260811.1

Repro Steps:

1. Create a Linux Web App.
2. Deploy a project to the web app.
3. Create a deployment slot without cloning configuration from an existing slot.
4. Swap the slot with production.
5. Execute "Start Streaming Logs" for the slot.
6. Observe the output window.

Expect:
Log streaming displays valid application logs without unexpected characters or corrupted output.

Actual:
The output window displays a large amount of repeated "NUL" characters during log streaming for the deployment slot after the swap operation, making the log output difficult to read.

More Info:
This issue reproduces consistently after swapping the deployment slot with production.