Yesterday, my Paladin was in stealth and trying to use Divine Sense (60 feet) to look at certain humans (avoiding spoilers).
Using this feature, which is not a spell, is silent, etc. somehow always triggered combat.
My characters can cast spells and remain in Cautious mode / stealth, yet Divine Sense triggers combat.
It has no casting and should be a somewhat "subtle" effect, especially when used 35 feet away hidden.
nb : it could be a bug or not, so I am mentioning this issue in the "game mechanics" forum. I do not think it is exploitable that a player think about using this feature once in a while before a fight. Currently, it not only triggers the combat, but also burns my first action. I suggest it be like many spells that can be used without triggering the enemies.