Ohh, I see... yeah, I forgot what happens when I delete a hull vertex...: translate coordinates change. :rolleyes:
Then, the only "automated" way I see to have flexibility in modifying linked meshes for larger variations is not trimming and using the full canvas for each image I expect having those variations (as I mentioned in another post). And not changing the canvas size later, ofc.
The other way would be doing what I did in the past: using GIMP to match the new layers into the master image and export preserving the image size of the original.
Well... actually there's a third, which is a modified first: exporting without trimming, then square-cropping from the center to the same size of the master mesh. Then you can create a linked mesh with the new image and nothing gets deformed.
I would have liked an automated way to do this, but that would require using the original image translate coords instead of the current mesh translate coords. Probably a bit obscure... and both the script and the editor would need to be modified to accept this behavior.
Thank you for the explanation. 😉