Attaching Cursor to running container doesn't show "Extension install" Pop-Up and doesn't keep installed extensions after reboot

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Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

There are two bugs related to this issue:

First bug

When attaching cursor to a running container for the first time (using Anysphere Dev Containers), it used to directly check the “.vscode/extensions.json” and ask you, if you would like to batch install the extensions via a pop-up.

A few releases ago this is not the case anymore, so after you attach cursor to the running container, you always have to go to the “Extensions” Tab and manually type in @recommended to show all recommended extensions and then install them manually one by one.

Second Bug

When using Microsoft’s Dev Containers extension, you have to only install the extensions only once, when you attach vscode to a container for the first time. Even if you restart the PC (or WSL) and then reattach to the same container, Microsoft’s Dev Containers extension, will know, which extensions you installed the last time you attached to this container and will reinstall them automatically.

When using the Anysphere Dev Containers extension, you always have to manually install the extensions after reboot. Which gets quite annoying.

Also you always have to manually reindex the project code, if it exceeds a certain size in the cursor settings, even if you already reindexed it once, it doesn’t keep on reindexing automatically.

Steps to Reproduce

First Bug

  • Have a container running with a VSCode extensions.json in /var/www/html/.vscode/extensions.json
  • Attach Cursor to /var/www/html using the Anysphere Dev Containers extension
  • See no install pop-up

Second Bug

  • Have a container running with a VSCode extensions.json in /var/www/html/.vscode/extensions.json
  • Attach Cursor on /var/www/html using the Anysphere Dev Containers extension
  • Install all extensions manually
  • Restart WSL / computer
  • Reattach to the same container on /var/www/html
  • The extensions are not automatically installed and need to be installed manually again.

Expected Behavior

First Bug

  • The install Popup should appear

Second Bug

  • The extensions should be automatically installed on reattaching Cursor

Operating System

Windows 10/11

Version Information

Version: 2.6.21 (user setup)
VSCode Version: 1.105.1
Commit: fea2f546c979a0a4ad1deab23552a43568807590
Date: 2026-03-21T22:09:10.098Z
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

Does this stop you from using Cursor

No - Cursor works, but with this issue