Searching "Intitle:" does not work when filtered for a notebook

[aukirk 368]

I use the search parameter "intitle:" A LOT.... when applying a filter to a specific notebook searching "intitle:xyz" returns no results even though there are notes.  If I just search "xyz" it finds the results, but also searches the full note, which is not what I want.

I am on 10.16.7, and I am not sure if this is a new "bug", but I haven't noticed it through all the other v10 versions I have been using since beta