MC LAUNCHER 2.1.7658 not starting under Wayland using Ubuntu 18.04 and Ubuntu 19.04.
The icon appears but the main windows / UI never appears. Previous launcher version worked fine.

The following appears when launched using the cli:
(minecraft-launcher:31037): Gtk-WARNING **: 13:06:22.363: Theme parsing error: gtk.css:3841:23: Junk at end of value for outline-offset

(minecraft-launcher:31037): Gdk-WARNING **: 13:06:22.447: ../../../../../gdk/x11/gdkwindow-x11.c:5611 drawable is not a native X11 window

Reinstalling doesn't work and i can't seem to revert to the previous version since i can't find any launcher archive containing these downloads. Changing the display server to xorg renders the Minecraft launcher to launch like it supposed to but using xorg as the main display server is a no go.

edit: running the following command starts the launcher under Wayland using x11: GDK_BACKEND=x11 minecraft-launcher