Remote SSH broken for multiple nested proxyjump

Bug Report
1

Consider an SSH config like:

Host first
  HostName xx.xx.xx.xx
  identityfile C:\path\to\first\idkey
  User ubuntu
Host second
  HostName compute-permanent-node-xxx
  User ubuntu
  identityfile C:\path\to\second\idkey
  ProxyJump first
Host te
  HostName localhost
  Port 11111
  User root
  identityfile C:\path\to\te\idkey
  ProxyJump second

In my testing,

  1. ssh first, ssh second, ssh te all work on cmd.exe
  2. in cursor’s SSH, I can connect to first and second, but not te, which gives this:
[Info  - 11:01:10.769] Resolving ssh remote authority 'ssh-remote+te' (attemp #1)
[Error  - 11:01:10.797] Couldn't get identities from OpenSSH agent
Error: Failed to connect to agent
	at Socket.r (c:\Users\a\AppData\Local\Programs\cursor\resources\app\extensions\open-remote-ssh\dist\main.js:1:115762)
	at Socket.emit (node:events:513:28)
	at Socket.emit (node:domain:489:12)
	at emitErrorNT (node:internal/streams/destroy:157:8)
	at emitErrorCloseNT (node:internal/streams/destroy:122:3)
	at process.processTicksAndRejections (node:internal/process/task_queues:83:21)
[Trace  - 11:01:10.797] Identity keys:
C:\path\to\te\idkey ecdsa-sha2-nistp256
[Error  - 11:01:10.800] Couldn't get identities from OpenSSH agent
Error: Failed to connect to agent
	at Socket.r (c:\Users\a\AppData\Local\Programs\cursor\resources\app\extensions\open-remote-ssh\dist\main.js:1:115762)
	at Socket.emit (node:events:513:28)
	at Socket.emit (node:domain:489:12)
	at emitErrorNT (node:internal/streams/destroy:157:8)
	at emitErrorCloseNT (node:internal/streams/destroy:122:3)
	at process.processTicksAndRejections (node:internal/process/task_queues:83:21)
[Trace  - 11:01:10.800] Identity keys:
C:\path\to\te\idkey ecdsa-sha2-nistp256
[Error  - 11:01:11.823] Error resolving authority
Error: getaddrinfo ENOTFOUND compute-permanent-node-761
	at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:109:26)

I reported this 4 days ago on (what I believe to be) upstream in open-remote-ssh here as well.

2

got the same error when trying nested proxyjimp