I figured out which firmware has this bug! In the last three weekly firmwares, namely on Xiaomi Mi11 (22.2.17), (22.2.9), (22.1.19) - there is a problem when typing when pressing "comma", "space" and "dot". You can see it on the video.
(22.1.13),(22.1.5),(21.12.29) - there is no such problem...