Maya 2023 weird boolean behaviour

[davidSFL]

Hi, 
So i noticed some weird boolean behaviour in maya 2023 / 2023.1. 
Difference Boolean in particular.
 

So when i perform a difference boolean, it works as i expect, the issue starts when trying to clean up the operation. 

2 things happen.

- The Shading Group gets disconnected.
The shader turns green as soon as i perform any further operations on that mesh, such as  connecting or welding verts for example. This gets pretty annoying very fast, when performing lots of operations during a modeling session. 

- I dont know what happens exactly, but when connecting vertices on the boolean object, maya does a bunch a weird connections by itself. Something that did not happen in older version of maya.
This way, cleaning up a boolean mesh becomes a lot harder than it should be.
This happens even after freezing transforms and deleting history on that object! 

The red line indicates the connection i did. The rest is what happens once i hit connect components. 

As an addition to that, maya also seems to disconnect shading groups on bridged faces at times. 
The green faces are faces created with the bridge operation.


I guess both these behaviours are not intended, as they havent been present in older versions, and they make no sense to me. 
Maybe someone can elaborate on that.

[mcginnc]

Hi David - Ok so the model looks like a cube with 2 extrudes and you've used cylinders to cut out the cube. Assuming that you deleted history? What are your settings for the cleanup tool? I haven't been able to reproduce this. Thanks, Catherine

[davidSFL]

Hi Catherine, Thanks for your reply. 

I didnt use the cleanup tool.
I cleanup manually most of the time.

As for reproducing, here are the steps i took:
1. open a new scene

2. create a cube

3. extrude 2 times , so you get the gun-like shape.

4. create a cylinder

5 doublicate the cylinder

6. place both cylinders and combine

7. delete all history

8. perform difference boolean a-b

9. delete all history

10. perform an extrude on the "gun"
At this point the shading group should get disconnected, which in fact it does not while i test this again right now.
So this might have been a scene related issue. 

however,
11. after the extrude (Step 10) select 2 verts, one from the cylinder cutout shape, and one from the "cube-gun".
A bunch of useless edges should appear on the mesh, connecting random verts, kinda destroying the mesh in the  process. 
^This i can reproduce all day.