I use Dbeaver at Ubuntu 20.04. In some undetermined circumstances I get problem with typing anything inside input fields of dbeaver. I am only able to mouse-click on fields, I can neither use arrows to move over the interface nor type anything inside innput fields with my keyboard. Meanwhile I don't get any problem with other desktop software. I have this problem with either Java 11 or Java 13. I also tried dbeaver in stable versions 7.1 - 7.3 and in edge versions. In each combination I get this problem but as I said - it occurs without any visible reason. But when it occurs only reinstalling dbeaver helps getting back to normal behavior.
How can I debug this kind of issue to find out where is the problem? What could be the reason or what is the solution for this issue?