The copy button copies not the marked text but all the text in the slide in new pages textbox.
If it does not copy on second or third try then it is clearly a silica bug as I use the clipboard and its copy function there.
It is wanky since version 1.0 and I guess there is an error in lipstick but I am not sure.

Update: Updated the package on openrepos due to a slight packaging problem that caused some qml files to be older than they actually should be.

Get the RPM from openrepos

Maybe the copying works better with this version.