I am confused. As I said, it is doing what the post you referenced says it should do. That post makes no reference to grouped searches.
- How did you generate the value in the search box? Neither of the templates in the post you mention can populate the search box. Instead they are designed to make clickable links in book details.
- What grouped search? If you made one, what is its definition?
Quote:
Originally Posted by Wiggo
As I wrote, it still works, only the new look of the search phrase irritates me.
In the past group search with aliases looked like the second screenshot too.
At least I think that's what it was like. Memories are sometimes deceptive, but I should have noticed something like that.
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#pen_names contains search links. It can't have worked if shown like this image because it won't match #pen_name's contents.
This image shows the contents of #pen_names.

Perhaps the best way forward is for you to describe exactly what you are doing, including the grouped search definitions, the templates, and what you do to make the group search you say changed.
EDIT: I tried experiments back to calibre 6.29 and it behaved the same way.