Lightroom Classic CC import lens metadata incomplete

Hi - new to this forum, hope someone can help.

I've just done a bulk import of all my old photos, which include thousands where the lens metadata is recorded properly against the image, which I can verify by opening the image on my Mac using preview, then using the Inspector.

So, for example the metadata for my lens in the Inspector reads:

However, the panel in Lightroom omits the brand specific information and shows as follows:

So, only 16.0-35.0 mm f/4.0 is shown rather than AF-S Nikkor 16-35mm f/4G ED VR.

This means that the lens is therefore not shown in the database so i can't apply lens-specific corrections in the Develop module.

My problem is even more pronounced in that the lens I have used for the last few years - my trusty 28-300 has also not been imported properly across over 6,000 images, yet, strangely for 165 it has.....

Exactly the same lens was used, and the metadata is intact on the original file.

Can anyone please suggest what has happened here?

I'm tempted to just do a new import to see if that fixes the problem.

Many thanks,

Paul