I have the same issue which started in the last week or two. In my case, when I first open Opera and enter in a search in the search field om my speed dial page, the search results only have the first 2 characters of the search terms or phrase that I entered, Opening a new tap and performing the search again works fine.
Opera 99.0.4788.77 though it started at a previous 99.0.4788.x version.