I do not know what has been happening, but some of my stuff has been disappearing lately.
I always carry about 100 black official signs with me in my inventory, and when I logged in one day, it was all gone
I checked all my chests and could not find them
I also had a few Christmas trees in my inventory at the time (there were only 6 silver trees and 8 gold trees, so it wasn't really much), but they went missing around the same time that the signs went missing. I did notice, but I just thought I probably put them somewhere. Today I was looking for them and I couldn't find them.
Some of my water has also disappeared, but it wasn't really much (only about 200) too.
The same issue has happened to me before back in around 2016 with a lot of glass, but that was long ago.
I have thoroughly checked each and every chest, but I could not find my missing items. I gave up on finding the signs, but I still need to find my Christmas trees..