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I think others have said it already but the most likely thing going on is that the Start in your Inventory script is running before the Start that...
Maybe check the width of the 'in between' element that's being filled with the sprite? Then since you know the width of the dot you could...
I think this is what you're looking for:...
I suspect it's something in your own code rather than a Unity bug. Is it possible that you're somehow setting frame 1 false in some other code?