"unexpected end of parent stream" on empty or missing "known_hosts"

• VSCode Version: 1.109.0
• Local OS Version: Win 11 232H2
• Remote OS Version: Ubuntu 24
• Remote Extension/Connection Type: Dev Containers/WSL/Remote - Tunnels/VS Code Server: DevContainer
• Logs:

Steps to Reproduce:

1. Ensure that on host %userprofile%\.ssh\known_hosts is empty
2. Ensure that in WSL ~/.ssh/known_hosts is empty
3. Build a DevContainer
4. Error message:

[2026-02-09T06:36:15.182Z] Start: Run in container: # Test for /home/user/.ssh/known_hosts and ssh
[2026-02-09T06:36:15.183Z] Start: Run in Host: gpg-connect-agent updatestartuptty /bye
[2026-02-09T06:36:15.185Z] 
[2026-02-09T06:36:15.185Z] 
[2026-02-09T06:36:15.185Z] Stop (3 ms): Run in container: # Test for /home/user/.ssh/known_hosts and ssh
[2026-02-09T06:36:15.185Z] Start: Run in container: # Copy /home/xyz/.ssh/known_hosts to /home/user/.ssh/known_hosts
[2026-02-09T06:36:15.185Z] Stop (2 ms): Run in Host: gpg-connect-agent updatestartuptty /bye
[2026-02-09T06:36:15.187Z] Stop (273 ms): Run in Host: docker exec -i -u root bacbe3c948f50a74fdabf1dabdc49e7a172495fb45e56b8b320bb89722ccaf1b /bin/sh -c echo "New container started. Keep-alive process started." ; export VSCODE_REMOTE_CONTAINERS_SESSION=57525266-1e4c-441b-aa36-833a93fde6b71770618969740 ; /bin/sh
[2026-02-09T06:36:15.187Z] Stop (240 ms): Run in Host: docker exec -i -u user -e VSCODE_REMOTE_CONTAINERS_SESSION=57525266-1e4c-441b-aa36-833a93fde6b71770618969740 bacbe3c948f50a74fdabf1dabdc49e7a172495fb45e56b8b320bb89722ccaf1b /bin/sh
[2026-02-09T06:36:15.187Z] Stop (78 ms): Run in Host: docker exec -i -u root bacbe3c948f50a74fdabf1dabdc49e7a172495fb45e56b8b320bb89722ccaf1b /bin/sh
[2026-02-09T06:36:15.187Z] Stop (11 ms): Run in Host: docker exec -i -u user bacbe3c948f50a74fdabf1dabdc49e7a172495fb45e56b8b320bb89722ccaf1b /bin/sh
[2026-02-09T06:36:15.190Z] unexpected end of parent stream
[2026-02-09T06:36:15.191Z] Keep-alive process ended.
[2026-02-09T06:36:15.191Z] Error reading shell environment.
[2026-02-09T06:36:15.191Z] Shell server failed: Error: unexpected end of parent stream
    at bi.destroy (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:26563)
    at bi.write (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:27304)
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:29407
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:14823
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:17466
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:23816
    at r (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:17414)
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:17459
    at Object.cb (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:23927)
    at l (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:21923)
    at u (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:22185)
    at c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:12:22268
    at s (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:15:5371)
    at Socket.<anonymous> (c:\Users\xyz\.vscode\extensions\ms-vscode-remote.remote-containers-0.442.0\dist\extension\extension.js:15:5472)
    at Socket.emit (node:events:519:28)
    at addChunk (node:internal/streams/readable:561:12)
    at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)
    at Readable.push (node:internal/streams/readable:392:5)
    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)

5. Adapt ~/.ssh/known_hosts so that it is not empty: echo "# Dummy Entry" > ~/.ssh/known_hosts
6. Re-Build container -> no error