Range selected or not, the keywords and tagging do not show up when the clips are batch shared/exported from the FCPX browser although the export setting displays all the info on the description and the tagging fields.
FCPX 10.4.8 / Mojave 10.14.6
Thanks for highlighting this odd behavior with the screen captures.
As expected, the FCPX browser/timeline pull up the keywords imported from tagged clips in finder but in reverse, the finder fails to display the keywords/tagging of the same batch exported clips.
On the other hand, Findrcat app, intelligent assistance, manage the reverse action successfully.
BTW, your screenshot shows only exported FCPX project, have you tested on the multi clips with range selected (from browser, timeline). Do you get the same result? If you do so, then you can't do any search based on tagging in finder since the tag fields are empty for batch exported clips.