Arcane Trickster's Mage Hand Legerdemain doesn't work properly. The description for it is just completely wrong.
At level 9, the Arcane Trickster is supposed to get Magical Ambush. Enemies have a Disadvantage on saving throws against your spells if you're hidden. This isn't working properly. To gain 'Magical Ambush', an Arcane Trickster is forced to hide in a well lit area first to activate the ability. If you hide where you're supposed to hide (in shadows), the ability activates, then immediately de-activates. This is an issue that's over a year old.
At level 10, the Arcane Trickster is supposed to become caster level 4, and have x4 level 1 spell slots, and x3 level 2. At the moment it instead gets x6 level 1 spell slots (!?!) and keeps only x2 level 2 spell slots for the remainder of it's levelling to 12. Not only is this not RAW but it somehow manages to make the weakest class in the game even weaker. This also qualifies this as a bug that seems to have been the same since launch.
This basically means that every single unique feature of the Arcane Trickster class is completely bugger and has been for at least a year.
I get it that Larian do not like Rogues, despite them being one of the most popular classes in both tabletop and in this game (I can't think what else would prevent them fixing this class. It's literally Astarion's default class for crying out loud!) but this really, really needs to be fixed up I would think?!