I’m experiencing this issue too since 1.8.4 on my Lenovo Tab M9 and Bluetooth keyboard. It’s been described very well in previous posts such as the one by pohangsteelers_fan and the original poster SHEP73
As others have also mentioned, there is no issue with any other application that I’ve tried. The keyboard and tablet have been working fine to use with Obsidian on Android since I bought the keyboard in June last year.