As per this:
Optimizations:
● Decreased possible performance drops on the Flea Market, presets, handbook, stash, skills, and tasks screens;
● Various client optimizations.
List of changes:
● Now, when transferring a container needed to complete a task/craft/zone construction in the Hideout, you can only hand over an empty container. When trying to transfer a non-empty container, you’ll receive a notification saying “You can't hand over a container with items inside”
● Changed the conditions under which Scav bots took a prone position when engaging a player;
● Added new sounds for SCAR-L, different from SCAR-H.
List of fixes:
● Fixed an issue due to which shotguns were not dealing damage;
● Fixed an issue causing infinite loading into a raid as a Scav;
● Bots can phrase about other Scavs’ dead bodies again;
● Fixed the possibility of rain appearing indoors;
● Added missing sounds in third person for characters falling from a height/ledge;
● Scavs no longer slide in place when changing position;
● Bots no longer walk through the train on the Lighthouse location;
● Bots now equip found weapons on their back instead of putting them in the backpack;
● Keys listed on Flea Market now display durability again;
● Spamming the Caps Lock key while moving no longer lets you move almost silently without a significant slowdown;
● Player uphill movement now looks smooth again in third person;
● Fixed the ability to become invisible while using an AGS grenade launcher as a Scav;
● Fixed the ability to look through the bunker walls on the Reserve location;
● SJ6 TGLabs stimulant now correctly increases maximum stamina again.
Source: https://www.reddit.com/r/EscapefromTarkov/comments/syhuqn/patch_01212153_notes_from_bsg_twitter/