Still looking into this, because I'm still not too sure what I could have changed that could cause a difference in this between any version? I might be able to add a padding variable or something if it persists?
Viewing post in Series of quads not slicing correctly
I can't remember if the behavior changed across versions, but a padding variable might fix it. After a while, I noticed that adding my own padding was still inconsistent at different screen resolutions, so I just created a game object for the image instead of trying to insert it as a quad. It worked for me given the situation, but enough padding might have fixed the problem too.