Taken from the developer's own announcement, quoted rather than summarised. The full post is linked at the foot of this page.
Survivors! Hotfix 1.6.1 just rolled onto the servers, so make sure to update the game!
Here are the list of fixes and tweaks:
Reduced hunger drain when sleeping
Slower overall hunger depletion
“Very Hungry” and “Famished” states now trigger later
Vendors now offer improvised food bars
Weapon Blueprints from DLC bundles can now be upgraded to Legendary rarity
When receiving a new weapon during a cutscene with a full inventory, the lowest-quality weapon is automatically moved to the stash
If both inventory and stash are full, the lowest-quality weapon is dropped on the ground
“Better Be Safe” and “Peace Bringer” achievements no longer auto-complete
Night chases rebalanced – Level 1 chases are now slightly easier to escape
Increased chances to loot rags and bandages from Biters and Virals
Fixed the crossplay connection between Steam and Epic
Fixed the issue with amount of ammo that the Player can loot from ranged human enemies being capped
Fixed the issue with Player dropping equipped weapon after entering Slasher arena
Fixed the issue with hunger meter missing throughout the fight with The Beast
Fixed the issue with Alpha Volatile sometimes not spawning during Chase sequences on Restored
Land
Fixed the issue with “Days Survived” being counted after starting a race
Fixed the issue with Leaderboards sometimes missing
Fixed the issue with message about Restored Area always appearing after loading a save
Fixed the issue with some encounters being unresponsive
Fixed the issue with Items Found values in the Leaderboard section
Fixed the broken Night Cycle after quitting to the main menu during challenge
Fixed a few collisions in new Roadkill Rallies
Fixed the issue with item stacks being incorrectly subtracted while moved to the Stash
Fixed the issue with Player receiving the achievement "Apex Predator" without killing a Volatile after a cutscene in “One flew over the Volatiles’ nest” mission
Fixed the issue with SFX missing after failing to load a broken save file
Fixed the issue with infinite death loop happening after Player gets out of map/playable area during
Roadkill Rally
Fixed various unresponsive NPC’s while playing in Coop
