Does this issue occur when all extensions are disabled?: Yes

Version: 1.63.0-insider (user setup)
Commit: a7104f1
Date: 2021-11-08T05:14:49.440Z
Electron: 13.5.1
Chrome: 91.0.4472.164
Node.js: 14.16.0
V8: 9.1.269.39-electron.0
OS: Windows_NT x64 10.0.22000

Steps to Reproduce:

1. Run VS Code or VS Code Insiders with the flag --disable-extensions
2. Observe developer tools console

Expected: No error messages or warnings

Actual: (node:22768) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.(Use Code - Insiders --trace-deprecation ... to show where the warning was created).

Running code-insiders --trace-deprecation results in this message: Warning: 'trace-deprecation' is not in the list of known options, but still passed to Electron/Chromium.

According to one of Live Share's commenters, this is where the issue may be coming from: microsoft/live-share#3331 (comment)