I noticed a new menu was added to Source Image tree in Project Panel about "Set as input image to selected artmesh"
Which is a welcome change since I used that function a lot and I don't have to go through long list of Model Guide image tree!
However I noticed a slightly different behavior between the same menu in Source Image and Model Guide Image tree.
First I made a copy of an artmesh

Then I apply the 'Set input image' from Model Guide Image tree menu to the new copied artmesh, which will update the target mesh as expected.

However if I do that through the menu in Source Image tree, it updates both of copied artmesh and original artmesh.

Is this an expected behavior or is it a bug?
I am using Live2D version 4.1.05beta1.
Thank you,
Comments
Thank you for your contact.
This is Live2D Support.
These are two different functions with different names.
Source Image: “Set as input image for the modelimage of selected ArtMesh”
Replaces the layer image referenced by the modelimage associated with the selected ArtMesh.
Model Guide Image: “Set as input image for selected ArtMesh”
Replaces the image referenced by the selected ArtMesh.
Please refer to the following page for Source Image and Model Guide Image.
https://docs.live2d.com/cubism-editor-manual/original-picture/?locale=en_us
Please use differently depending on your purpose.
Thank you for your cooperation.