This an Apple bug present from macOS 10.13 to 10.13.3. It is not present in 10.13.4 beta.
Jérôme - CTM Engineering
---------------------------------------------------------------------
"Until FoxTrot I found paper filing in folders in a filing cabinet
was more reliable than file retrieval on the Mac."
FoxTrot Personal Search user comment on
macupdate.com
Download a demo version from
www.foxtrot.ch
---------------------------------------------------------------------