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Again there is nothing in the log that I can see of any pop up asking to scan the library. Did it pop-up when you created that log? Can you provide a screenshot?
What I notice is lots of "Embry" entries, and I can't remember how that interacts with Kodi and music library, but it isn't a vanilla installation so will make investigating your issue harder as far as I'm concerned.
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I don't see any problems in that log file. The log file shows it scanning as far as folder music/MaCollec/Amparanoia, at that point you turn off the debugging.
Do you allow it to complete a rescan of tags from all music files without interrupting it? It takes place in the background so that you can continue to use Kodi, however if you power off before it is completed then that would be a reason for it to prompt you to do a rescan next time you run Kodi.
My guess so far is that you are interrupting the scan by powering off before it finished hence Kodi keeps prompting you.
If you are letting the scanning run to completion, and it still prompts you to rescan next time, then please provide a debug log of it scanning until completion. This log file could be large and need breaking into pieces, and yes you need to enable debugging before you start.