Steps to reproduce the issue:

1 - Open a Qt Quick app (e.g. calqlatr)

2- Go to the Design mode (make sure the plugin in on)

3 - In the Code view, select a line of code an click on Ctrl + C

4 - Go back to the Editor view and try Ctrl + V...

to realize that short cuts does not work anymore (at least Ctrl + C, V, X)