Apparently just got unlucky
Sounds like this commonly fixes itself, but I happened not to get it this time. I've confirmed that all the data in the record is correct a second time, but check-in still shows Sky Priority but not TSA Pre-Check. I had not mentioned that there was an international leg on this, which but it may be the difference. As it stands, I'll just shift theories to assume I won't get it.
Thanks for the informative replies,
Skippy