I have been plagued recently with issues stemming from neovim's interaction with the system clipboard. Every time I would copy text in nvim, I'd get a transient wl-clipboard window. Inside nvim, paste would work fine, but outside it, the system clipboard seemed not to get the contents.

I finally tracked it down to how Wezterm is interacting with Wayland.

And the culprit appears to be... the muxer.