No, nothing has changed! Search only looks in the physical title and text fields of the tiddler. Transcluded content is not actually part of the text field of a tiddler – TiddlyWiki only shows it there when you look at the tiddler – so it doesn't show up in search, either.

If you search for the transclusion itself – like, the part that looks like {{JaneDoe}} – then you will find that, because that text is physically located within the JaneDoe tiddler's text field. (But if you type the braces into the ordinary search bar, it doesn't like special characters and won't find anything. Type just JaneDoe and you'll find that any tiddler that transcludes JaneDoe shows up.)