Quick update.
I took the bike and the tiny screw to the dealer to see what they said and they laughed at me saying I'm overthinking it and it's so tiny it's less thick than the tread. They said just keep the screw so you can laugh about it in the future, but nothing to worry about.
I told them it was the forum's fault that told me to replace, plug, be careful, no longer safe...etc


Actually the owner was so cool, he gave me a pen gauge!
But seriously, thank you for everyone's input, much appreciated.