Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.58.2
• OS Version: macOS 11.4

Steps to Reproduce:

I wrote a test case inside VS Code which reproduces the error. Then I added a patch which fixes it.

This is what asWebviewUri currently returns (bug) https://vscode-remote%2Blocalhost:8080.vscode-resource.vscode-webview.net/Users/codey/file.html and then is what it should return with the fix https://vscode-remote%2Blocalhost.vscode-resource.vscode-webview.net:8080/Users/codey/file.html