LR can be pretty slow in updating the metadata status of photos. If you wait for, say, 30 minutes, do all the photos eventually show up in the smart collection? If not, in the Library Filter Bar, select Metadata and configure a column to filter of Metadata Status. Do all the photos filter according to their correct status?
Nothing happened after about 20min. Only some were added if I was in the folder where the changed photos are (using the library view).
Filter also doesn't work, it shows the same amount of photos.
Would be great if there is a manual option to force check if metadata has changed on file system.
- In the left-hand Catalog pane, select All Photographs.
- Do Edit > Select All to select all photos.
- Do Library > Find All Missing Photos.
When I had somewhat related issue with slow update of metadata status, that command seemed to sometimes speed it up.