Good news. I tested all of Haiku’s core distro 3D apps and screensavers without any KDL-related open/close windowing issues using Mesa 21.0.
Blender 2.79b/2.91.2/2.92.0, Stellarium 0.8.1, Godot 3.2,4rc1, DreamChess 0.3.0 - all work as expected.
Note: GLInfo needs to cleanly terminate. Fix was in progress as of today…
As expected, as expecteeeeeed… 
I have to check the Scene files to verify that they are not corrupted, as Godot now stalls when trying to open a Scene therefore I can’t continue working on the project. I’ll let you know what I find out.
Thanks for your work on Godot @cocobean. 
Regards,
RR
Haven’t you tested the Blender versions?
guys in case you are interested this is my theme for blender, (you will find more made by me) but this is the one I have worked on the most (in the tread there are thousands of themes anyway)
Just to inform those who don’t know, blender is also a very powerful video editor and compositor and 2D cartoon creator nowaday (Can’t wait for a full hardware acceleration on haiku)
Another interesting video that demonstrates how blender competes with professional video composers such as After Effect and Nuke ( always for those who are not already aware of it. )
