One workaround I've found was to click copy, open the steam overlay web browser, paste into it, copy from it, and only then will the string appear in the clipboard, same for pasting. This obviously does not work for the non-steam release, in which case You're sorta screwed
My system is using KDE Plasma with Wayland
![Image](https://wiki.factorio.com/File:Blueprint_string_preview.png)