This update was mainly an overhaul of the inventory system to optimize it (so basically a lot of boring code work), and fix a couple of major issues that have popped up (and are now hopefully fixed).
With this update items (and "appendages") should no longer be disappearing, and some inventory management actions should be more optimized.
And of course many other small updates and fixes.
You can find the patch notes here:
https://steamcommunity.com/app/342910/discussions/0/3192492886094333146/