@KittyNin I had exactly the same problem as you (it started mid February). Like you, I'd been side loading books for years without any problems and then they suddenly stopped showing up.
I ended up doing a factory reset. I now have firmare 5.12.4 and the problem has disappeared. Not sure what firmware I had before, but it was from about two years ago.
I don't like how this new firmware manages collections (all my books just appear in one long list instead of being sorted into collections), but at least I can confirm that the problem disappeared. My sideloaded books are now visible again.
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