Visual studio code JSON navigator doesn't work for ARM template after installed the ARM template extension.

[qingshanJBHIFI]

Based on the vs code doc, Ctrl+Shift+O is used to navigate between properties. But it is not working for ARM template after I installed the extension msazurermtools.azurerm-vscode-tools.
When I pressed Ctrl+Shift+O, it shows The active text editor does not provide symbol information. .
In the OUTLINE section on left navigation panel, it shows No symbols found in document ***.template.json.

After I disable the extension, the JSON navigator works again.

[StephenWeatherford]

@qingshanJBHIFI This extension is currently in maintenance mode, and we don't have the resources to fix this issue. However, I can offer a work-around:

First, go to VSCode settings (CTRL+,), and uncheck this setting:

Now when you open an ARM template file, you should be able to change between using the JSON editor and the "Azure Resource Manager Template". See this in the bottom right of the command bar:

Click on "ARM Resource Manager Template" and instead select JSON or JSON with Comments. Now you'll be able to access the file symbols. To use features related to ARM templates specifically (as opposed to JSON-only features), you'll need to switch back to ARM Resource Manager Template.

I realize this isn't perfect, but perhaps it will help.