SFTP using Proxy Jump no longer working

[khofer]

Hey,
I recently upgraded to Windows11. Now I cannot connect to my server via SFTP, although nothing has changed in terms of ssh configuration, etc. For context: It worked fine while I was on Windows 10, I still can access the server via the standard ssh via the command line, and File Sync without the proxy Jump still works, however as soon as there is this jump involved I FFS I get the attached error message as a response.
Has anyone any idea what I might be missing here?