Reading how copy-paste works from the Wayland specification is non-trivial unless you understand a lot of how desktop computing works and Wayland internal. It took me quite a while to figure it all out, though once you get there, it seems quite obvious.
Here’s my attempt at explaining how it works for mere mortals.
One of those things you do countless times every day, but don’t really know how it works.
Hm, no pasting after an app is closed? That’s a bummer, and pretty sure doesn’t affect other platforms to the same degree.
If this truly is just a Linux issue, how does copy-paste on other platforms handle it then?