Environment Details:
VSCode Version : 1.24.0
OS Version : Win10

Additional Details:
MAS Violated: MAS1.3.1
ScreenReader Version: NVDA2018.2

Repro Steps:

1. Launch VS Code while NVDA is ON.
2. Go to View menu and Select Problems.
3. Check the state of all the tabs(Problems,Output,Debug Console, Terminal).

Actual:
NVDA does not read the state of the tab Problems, Output, Debug Console, Terminal as (selected or non selected). Same Issue has also been observed with JAWS.

Expected:
NVDA should read each tab with its state either selected or non selected.

Recommendations:
Refer below link which is repository of bug fixes code snippets:
https://microsoft.sharepoint.com/teams/msenable/mas/pages/browse-fixes.aspx

User Impact:
User will not be able to know which tab is in active state and what action needs to be performed.

MAS Reference
MAS1.3.1- https://microsoft.sharepoint.com/teams/msenable/_layouts/15/WopiFrame.aspx?sourcedoc={54f28d1f-a2d1-4dcd-84e1-5c9b87e8aba4}

Attachment for Reference:
A11y VSCode Problems NVDA TabState.pptx

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