In the latest version I have a problem with disappearing Welding Masks. I had three, so thought it's more than I will ever need.
However, one of them was nowhere to be found at one point. OK, I thought – probably it was knocked off by a zombie in a scuffle and I didn't notice it.
But the second one I took disappeared like 20 minutes (real world time) after while being worn, and I was just walking around dismantling stuff, when suddenly it was gone. I didn't lose it or remove it, and it's nowhere to be found.
Same problem was present in other beta versions with the Lighters – I was running around with a Molotov in one hand and a Lighter in another, and suddenly there is no lighter anymore. I could go through 3-4 lighters before I was able to gather a horde and chuck a molotov at them. Had to switch to equipping it at the last moment, to ensure it won't be lost.
Playing on macOS Catalina, Steam version.