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I have a ton of books opened at all times (definitely more than 10 right now...) because I use the 'Reading' tab as a way of setting an immediate TBR, and I've noticed the same thing - I'm reading a couple of those books at the same time and when I change the font size in one it will be changed in the other as well instead of remembering the old settings. All kepubs (some sideloaded, some from the Kobo store. I know this explanation isn't very detailed, I'll try and see if I can notice more details.
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