Redmi S2, same issue. It happens after unlocking the phone but only if opera is residing in memory or whatever (if it's present in the app switcher, task switcher, whatever it's called). If it's launched fresh it doesn't happen.
Please check compatibility with MIUI because the problem seems to be limited this launcher.
You know you could manually type the "G" first, as in "g w akcji". Though yes, it is unfortunate that "w" is a word in and of itself in certain languages (in your case, Polish). Given Opera has offices in Poland you'd think they would take that into account ...
Thanks for your reply. Had my doubts about the chromium-package from the start. Glad you confirmed it. Now let's hope the devs at Opera can fix this issue with the Bookmarks zoom level so I can update to the latest version.