Updating from Jenkins to Version 2.505 to Version 2.550 cleaned out my entire jobs folder?

Jenkins setup:

I’m using Jenkins on windows server.

I upgraded via the msi from 2.505 → 2.550

It appears my entire jobs folder has been cleaned out and it’s as if I have a fresh install of Jenkins rather than an update like the msi disregarded any previously installed versions.. Is there anything I can do to recover?

Are the jobs just not visible in the UI but still there in the file system?

The Windows installer should not support an upgrade, so I am curious how this worked. The general path for upgrading on windows is to use the update center notification to update the war file. Do you have any logs that you can share from jenkins? I’ll try and reproduce the upgrade via the installer because it should not allow it.