Selecting alpha faces is running wrong when your image resolution ratio is not 1:1

[Kenimation]

Did the issue happen after restarting Blender?

• [X] Yes, the issue indeed continued after restarting Blender

Check known issues

• [X] I have checked known issues, and my problem is different

What happened?

Selecting alpha faces is running wrong when your image resolution ratio is not 1:1. When I am using selecting alpha in 64x64 or 16x16 images it works well. But in some cases such as 15x16 or 60x64 images, it doesn't work correctly.

What steps are needed to produce the bug?

To use selecting alpha in 15x16 or 60x64 images, doesn't work correctly.

What version of MCprep are you using?

MCprep 3.4.1

What version of Blender are you using?

Blender 3.4

[StandingPadAnimations]

Can you show a screenshot of the console?

[Kenimation]

You can see the first image. The alpha faces selection is broken. But it works well in 16x16 images.

[StandingPadAnimations]

Following up on this, I think we should work on a new route to detect alpha faces. The existing algorithm just approximates, so it's not perfect, but I think it can be made better

[StandingPadAnimations]

I'm marking this as a bug since it's a regression in the algorithm we use