Why does this speech bubble stop shrinking to fit the text when I change its sprite?

Unity Engine
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1

Please watch the video to understand what I’m talking about: https://www.youtube.com/watch?v=00ZHzlivxbM

As you can see, the two sprites have identical import settings. Despite this, when I change the sprite it stops shrinking to fit the text. Note that while the image type changes from “Tiled” to “Sliced” when I change the sprite, this is not the cause - changing it back to “Tiled” has no effect.

2

I finally fixed this issue by drawing a new sprite - the original flipped sprite was the unflipped sprite flipped in Doodle Studio 95. No idea why that would have been a problem, but apparently it was.