Thank you. I will try to, though my project was started on 2.93, and 2.93 vertex groups don't always transfer nicely to 3.X >_> ...

In this example, there are three cubes, each with its own material - green, blue and red. Materials are lost after 'attribute proximity' node is added, which otherwise doesn't modify anything.

They do support them, attribute proximity clearly has an effect on instances:

I tested it for a while with adfdae3fc2f4 / 26th of March build and couldn't reproduce the bug. Let's see what @KineticWasEpic (kineticwasepic) says.

I too experience it with selecting faces and edges, however with some pecularities:
-When selecting individual faces, everything is fine. The issue appears only when using box select or circle select.
-When I switch to front view or left view on a subdivided default cube and try selecting individual vertical edges, everything is fine. However I can't seem to select individual horizontal edges (hardly anything ever is selected, and when it is, it's the wrong edge). Again, box select and circle select are wacky.

In T59735#608173, @Sebastian Parborg (zeddb) wrote:

And this isn't a problem in 2.79?

In T59735#606459, @Sebastian Parborg (zeddb) wrote:

Are you using the latest nvidia drivers? (417.71)

Does this happen if you change the Selection method in blender preferences? (You could try to turn on opengl depth picking).

I'm running linux myself however with an AMD card and I don't seem to have any of these issues.

In T59735#605338, @Sebastian Parborg (zeddb) wrote:

I can not reproduce this on my end. Could you see if you still get this problem with the newest blender beta?