nRF Connect extension no longer flashes

[nrbrook]

VS Code extension updated to 2025.8.654. Now when I click flash it says

Executing task: nRF Connect: Flash: application/build_reactor_release (active) 

Flashing build_reactor_release to nRF52 DK

And sits there spinning. Running west flash manually works.

Extension Features > Runtime status has 5 uncaught errors, all "No mainBuild in Sysbuild"

Extension output:

[06:30:03] ENOENT: no such file or directory, open '/Users/nick/Documents/Repos/.west/config' (/Users/nick/Documents/Repos)
[06:30:05] =========== Toolchain validation report for nRF Connect SDK Toolchain v3.1.0 ===========
📦 Using the nRF Connect SDK 4.3.0.6-b.6 at /Users/nick/Documents/Repos/AirTurn-Firmware-PG
No issues were detected with the toolchain.

I'm using a west workspace. my app is in "/application". /application/west.yml:

manifest:
  self:
    path: application
  remotes:
  - name: nrf
    url-base: https://github.com/nrfconnect
  projects:
  - name: sdk-nrf
    remote: nrf
    path: nrf
    revision: v3.1.0
    import:
      path-prefix: external-3.1.0
    clone-depth: 1

The extension says the SDK is "third party" with the version being the version of my App. This seems incorrect.

How can I revert to the previous extension version? I can't select it from "install specific version"

[gloverde]

Edvin I'm seeing a similar problem. We are also using a toolchain that has been installed in a custom directory and an NCS version specified and imported via west.yml.

SDK: "3rd Party v3.0.0*

Toolchain: "nRF Connect SDK Toolchain v3.0.0"

I can no longer build at all via the extension. Can't flash either.

I can build via command line fine.

[gloverde]

The first build after creating a new build configuration succeeds. But the extension doesn't seem to catch on that it succeeds.

[nrbrook]

Same here.