Same here. With ALT+TAB I see the icon but not the window.
Fedora 30 and 31. Oracle Java and OpenJDK.
{{SaveToBuffer failed}} {{ [1108/234418.654550:ERROR:sandbox_linux.cc(346)] InitializeSandbox() called with multiple threads in process gpu-process.(minecraft-launcher:3545): Gdk-WARNING **: 23:44:19.722: gdkwindow-x11.c:5633 drawable is not a native X11 window}}
Pain Ltd
Same here. With ALT+TAB I see the icon but not the window.
Fedora 30 and 31. Oracle Java and OpenJDK.
{{SaveToBuffer failed}}{{
[1108/234418.654550:ERROR:sandbox_linux.cc(346)] InitializeSandbox() called with multiple threads in process gpu-process.(minecraft-launcher:3545): Gdk-WARNING **: 23:44:19.722: gdkwindow-x11.c:5633 drawable is not a native X11 window}}