When I last time use OpenMandriva LX 4.1 then the LXQT desktop environment worked well.
From what I know, this desktop is updated by @bero He update it for Cooker few weeks ago to latest version 0.15.0/0.15.1.
AND I test it today and looks like it works well.
So LXQT is working on Cooker. On LX 4.1 should works fine too but in older version.
In OpenMandriva we have well-functioning few desktops, like GNOME, MATE, Cinnamon, Xfce, LXQT, IceWM, i3, Sway, Lumina and LiquidShell but we choose Plasma5 as your main desktop and most of efforts are directed at KDE. But other environments work well.
Here is more details about other desktops env Additional desktop environments updated once again!