Thanks.
I believe that something prevented the import of really old files, taken with an ancient Nikon.
The import target has zero image file but had all the json files.
I don't consider this an issue as it skipped the entire source directory of images only taking the json.
No problem, I just didn't need these images anyway, they were in the takeout and I noticed.
The files without exif were random and out of 48 GB, I'd say less than 50.
I do only export/convert from heic to jpg.
Thanks again for the quick great work.