Resting - bg3.wiki
Warlocks also regain their spell slots. You can take a Short Rest twice per day. Choosing a Long Rest resets your available Short Rests to two.
Short rests - Larian Studios forums
Short rests are meant to recover HP and a spell slot with Arcane Recovery. Right? Am I missing something? Is anyone else NOT getting a spell slot back during short rests?
Forces of Fantasy: Wood Elves Faction Review | Goonhammer
Second, only having to sleep for 4 hours will allow casters (specifically Wizards, Sorcerers, and Warlocks) the ability to wake up before the rest of the party, cast a spell, and then Short Rest to get the spell slot back.