The workaround to this problem is to export the videos from Mac Photos.app by doing File > Export > Export Unmodified Original, not checking Export IPTC As XMP. It's not clear whether the problem is caused by a bug in LR or some behavior of the Mac Photos.app that invalidates the contractual permission Apple gave to Adobe to read the proprietary Keys:CreationDate field.
DETAILS
Normally for Quicktime / MP4 videos, LR reads its capture date from the industry-standard field QuickTime:CreateDate, interpreting that date/time as "local" (having no time zone).
But for videos recorded by Apple devices, LR reads its capture date from the Apple-proprietary field Keys:CreationDate, which includes a time zone, e.g. "2024:01:30 20:31:52-08:00". LR will ignore the time zone and display "1/30/24 8:31:52 PM" as the capture date.
For some reason, for Apple-device videos exported from the Mac Photos.app using File > Export > Export Video, LR doesn't recognize those videos as being created by Apple devices, so it reads its capture date from QuickTime:CreateDate. Further, the Photos.app Export command replaces QuickTime:CreateDate with "now", the time of export (though it preserves Keys:CreationDate).
I don't understand enough about the Quicktime format to know why LR isn't recognizing the exported videos as created by Apple devices. I compared the metadata using Exiftool and didn't see anything obvious.
When Adobe first implemented the special handling of capture date for Apple videos, they posted that they had to get legal permission from Apple to read the proprietary Apple field Keys:CreationDate. It may be that contractual permission included a specific combination of other fields that must be present for LR to read Keys:CreationDate, and Photos.app is stripping or changing some of those other fields. For example, Photos.app Export strips the detailed metadata in Track5 from the exported videos. But this is all just informed speculation.
If you'd like to increase the probability that Adobe will investigate this, I recommend you submit a new bug report:
https://community.adobe.com/t5/lightroom-classic-bugs/how-do-i-write-a-bug-report/idi-p/12386373
with the following information:
1. Attach a very short sample original video, exported from Photos.app with File > Export Unmodified Original.
2. Attach that video exported from Photos.app with File > Export Video.
3. Include screenshots of LR's Metadata panel for each of the videos imported into LR, including the Capture Date/Time field. (EXIF Date/Time Original is not relevant.)
It's not necessary to include the output from Exiftool -- the sample videos will contain all the necessary information.
Finally, a note on terminology: "EXIF" refers to metadata recorded by cameras as specified by the EXIF industry standard, as shown by Exiftool in the EXIF group. It doesn't include all the other metadata fields in an image or video, and in particular it doesn't include fields recorded under the Quicktime and MP4 standards (shown by Exiftool under QuickTime and associated groups).
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