I am using Rstudio 1.1.447 on a Lenovo T470s, running Fedora 31
I noticed that since a few days - probably/maybe since the last Fedora update - Ctrl-C/Ctrl-X are not working anymore.
The only way to put something in the buffer is by using the Edit-menu. Once the buffer has content, I can use Ctrl-V to paste the content.
I have tried if other applications have the same problem but the problems are restricted to Rstudio.