How about Spirit Guardians not breaking Invisibility?
Are you saying that it does? Or that you want it to do that?
Because it shouldn't. Invisibility breaks if the user attacks or casts a spell or if the concentration ends.
Or potion of haste letting you cast double Fireball?
That's not normal indeed. Haste (spell or potion) should only allow an extra action to attack (one weapon attack only), Dash, Disengage, Hide, or Use an Object action.
Personally, that I can think of right now, I could do with concentration not breaking when it shouldn't and smaller quantity of scrolls, potions and food.
