I guess it was some temporary issue (maybe only on my side) as I'm not seeing the error now

I'll not complain about the game but I'll about your invalid handle. Or it's my app that is broken...

Yes, in the code (unreal script)

You know what would be funny: track every click and see how many clicks people can make with a clicking leaderboard

Yes. They referenced it in the patch update (not the public patch notes) 2-3 months ago for the first time