This is a very nitpicky thing, but the mob stats menu says past tense "You killed x mob" instead of present tense "You have killed x mob"

Saying "You killed" is past tense. This means that you are done killing mobs. This would make sense only if you were in Hardcore mode and you were died and lost your world, but doesn't make sense if you are still alive or in another game mode and still killing mobs. The present tense "You have killed" is proper in this sense, as it means "Up until this point, you have have killed this many mobs, but you might not be done and can still kill more in the future".

As an example of this, "I ate 2 steaks" would make sense in a given time period that has ended (such as a response to how many steaks did you eat yesterday, past tense), but "I have eaten 2 steaks" is proper for saying up until this point, present tense. I have eaten 2 steaks, but I might eat more.