@Vaesse - not something I have ever seen or had reported. Certainly I use this plugin all the time to sync books without ever noticing any such issues, and yes I have a metadata plugboard to prepend series too. The only thing I don't do is happen to have the automatically invoke kindle collections feature turned on. I tend to do that as a manual step afterwards, just because I usually am doing other activities like removing books so don't want to regenerate it twice.
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