How did you install? Why is the install image still around to even be able to boot?
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The system has been around for years. It was originally a 20.04 install which I upgraded to 22.04. My guess is that the "install" is actually the recovery image partition.
In that case you should be able to rule out borked boot priority.
I'd be looking at the bootloader, next. You don't mention having multiple boot options, but it could be defaulting to the wrong one for some reason. Or because the one you want is unable to boot despite being otherwise fine.
I never multiboot (had enough of that pain years ago). I'll look into the bootloader but I assumed that Boot Repair would have corrected that. It might be that it didn't see the bit pointing towards the rescue partition as a problem.
You still have a bootloader, even if you only have one OS. And if you do have a recovery image as you say, you are multi-booting.
I recall the ability to boot from an encrypted partition requiring some additional config for grub, but I see no reason for boot repair not to account for that.
If you use some other bootloader, I've no experience.
~~Doesn't it even tell you to unplug your Install medium.
Just unplug your USB drive and boot.
(I don't want to sound too obvious, but at least do it first and tell me if it was really the only issue)~~
EDIT: I read in a comment that you did an upgrade.
The upgrade was about six months ago
I assume Pop!_OS shows the Systemd-boot selection at boot. If so, is it possible to switch which partition to boot to?