Just for fun, I re-enabled Fast boot yesterday. Now the number lock key is on after booting. So maybe the last Windows 10 update did something to solve this. Or maybe it works properly because I bypass the password login with the method described here: https://www.windows10forums.com/articles/log-in-to-windows-10-automatically.19/
I don't know how or why it started working again but I don't really care.
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