Can't modify C++ string type variable in local window

[Lili28]

• VSCode Version: 1.46.0.0
• OS Version: Ubuntu Server 18.04 LTS
• Cpptools: v0.28.3

Steps to Reproduce:
1.Open tests folder in attachments directly.
a.zip
2.Set a breakpoint on line 20 in a.cpp file.
3.Press F5 to start debugging.
4.When hitting the breakpoint, modify the value of the String type variable in the Local window and press Enter.

Excepted:
It can modify normally.

Actual:
It pop up a error message:

Investigation:
You can successfully modify int type variables in the local window.

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

[vscode-triage-bot]

This issue is caused by an extension, please file it with the repository (or contact) the extension has linked in its overview in VS Code or the marketplace for VS Code. See also our issue reporting guidelines.

Happy Coding!

[weinand]

Please file against C++ extension.

[Lili28]

Link this issue to another:microsoft/vscode-cpptools#5662