Hope it clarified why you had the problem. If you have access to a Windows PC, ExifTool has a version with a front end program available which is ExifToolGUI, making it much simpler to use:
https://exiftool.org/gui/
I'm not aware of an Apple version though, but maybe you can track down something similar.
Is there an update to your Apple Photos? I tried to see if there is but Apple's website doesn't seem very helpful.

You could try this perhaps:
https://exiftool.org
which will allow you to Read, Write and Edit Meta Information and it's regularly kept up to date.

I can't advise on Apple’s Photo Version 1.5 as I've not used it but presume it predates those DFA lenses. Surely other more recent software is available such as Photoshop Elements or even Freeware alternatives?

However it you're happy with Apple’s Photo Version and use it with ExifTool to update the lens info you'll probably be fine.

Just to add to the questions. What method have you used to determine the EXIF info is missing with those lenses? I'd suggest it might show up using an alternative method if the software you have used predates those lenses.

The lens type data is stored numerically in the EXIF and requires a lookup table in the software to translate it.
This is that table:
https://exiftool.org/TagNames/Pentax.html#LensType
If the table in the software you are using hasn't had those lenses included it wouldn't be able to make the conversion, hence without knowing where you saw 'No lens information' we can have no definitive answer!

The camera will pick up the number from the lens if it has one, even with future lenses. However the camera wouldn't be able to apply in-body corrections to a lens it doesn't know about, hence the firmware update requirement to enable that feature with the new lenses. Other software may be able to make the conversion and identify the lens even if the camera cannot.

We simply don't have enough information to answer the question yet!

Just the two DFA lenses? Others are OK?

Welcome to your first post by the way!

None, they work best at 90 degrees to the sun. They'll still work normally to reduce reflections on bright surfaces if there are any, but not darken the sky

David,
Are you in a position to return it for a replacement? If it's second hand already, maybe its former owner wanted shot of it for the same reason as you. Other copies of the lens get good scores at PF with an overall 9.06/10.
Your copy does sound iffy to say the least.

If you mean the 15-30 it shouldn't come close. I paid around £400 for a decent FA20 though some do ask more. Where can I get a DFA for that? More likely at least double the price.

If it has to be a prime there's the SMC Pentax-FA 20mm F2.8. It gets a 9.26/10 over at PF.

Goodness, you must have been seriously dehydrated. January's not out yet though!