So I updated my S20 as did my wife & looks like we're both experiencing the same issue:
So say you want to type "the year is 2022" but you want to use double tap to add a full stop (Keyboard: SwiftKey) after the final 2.
Since the update if you double tap, it'll remove the final number so the above would be "the year is 202."
Same happens if you add a letter. "the house is 220k" becomes "the house is 220."
Its just removing the last character every tim.
Actually there you go, as I've just typed that it removed the e so it works on everything not just numbers.
WhatsApp, text message app, here. Very very annoying.
What's going on?