pfSense has started creating missing SSH keys. SSH Startup will be delayed. Please note that reloading the filter rules and changes will be delayed until this operation is completed. @ 2022-05-01 12:55:10
That's normal whenever new keys are created. Which until 22.01/2.6 was every install or config reset.
You can recover the config from the pfSense install image as long as the partition is not completely destroyed, it gives you option before you install:
Worst case you can cat the recovered config to the console from there and copy it out into a file.
The only thing not backed up there would be packages pulled in directly from FreeBSD by specifying a different repo.
Those are not directly supported though
What did you actually have installed from FreeBSD?