Metadata not loaded for library file

I just added 15K files from a NAS. Most worked fine, but there are a few hundred that say:
Metadata not loaded for /mnt/images/PIX/PnShootCanon 2008-13/2008-05/2008_05_28/Concert280508_05.JPG
Looking at the actual file on the NAS, I can see there is metadata available (See screenshot)
I've already gone into the admin panel and clicked on Missing under the Extract Metadata job, which did not fix this.
What is the issue?
(Shouldn't be a permissions issue as this is mounted as a ro nfs volume with squash)
image.png
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