I left the post because someone else may not have figured it out.
Ah yes, this happens if you clone the same image then change the image. All instances of that image will change as you have discovered.
The solution is to hold down the Ctrl key and drag and drop your image onto the clone.
You will see a dialog asking if you want to replace just this image or all instances of the image. Your pick.
I don't think there is a way to turn this off.
This make sense.
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