@cristicc are you sure you are running pure Wayland, not xwayland? `COMPOUND_TEXT` and `TEXT` are not Mime type targets that Wayland apps expect, they are X11 targets, so if the `text/plain` or `text/plain;charset=utf-8` are there thats what a compliant Wayland app should accept.
It seems to indicate that Alacritty is running under xwayland or its confused.