Since downloading the one UI 2 upgrade with Android 10 on my Galaxy S10, autocorrect no longer works when I'm typing fast.
I have to pause for a moment after making a mistake if I want it corrected properly.
E.g. if I want "im" to be replaced with "I'm", I have to pause for a moment after typing "im" for the autocorrect to register, and replace it with "I'm" when I hit the space bar. If I don't pause, it won't be replaced correctly. Happens with all words with apostrophes, and all spelling mistakes.
@userVHTCMmpTbe Have you tried clearing the cache partition your phone?