Hello,
I recently upgraded to 74.1.4 from 68.14.8b and now search engine from the combined search-address bar doesn't work anymore. It only searches in my browsing history and selects the most similar URL.
When I was using 68.14.8b I had enabled search from combined address bar with "keywords.enable" set to true on "about:config" and this way both search on browsing history and on search engine worked flawlessly. In 74.1.4 with that option enabled it doesn't work.
I have also tested a fresh install with a new profile. By default option "Provide search suggestions" is disabled in browser settings, so I enabled it, also "Show search suggestions in address bar results" and "Show search suggestions ahead of browsing history in address bar results" but they have no effect. It still only searches on browsing history.