• Minecraft Username:
  • Expipiplusone
• Brief Description:
  • Under certain conditions, stuff vanishes from trade signs.
• Instructions:
  • Place more than 2304 (64-stackable) items in a trade sign;
  • with your inventory completely empty, "destroy" the sign.
• Expected Result:
  • You should get a full inventory of that item and some leftovers in the sign;
  • the sign should not really break, but it should stay there with the leftovers.
• Actual Result:
  • You get a full inventory of that item (so far so good);
  • the sign breaks for real as if it contained N <= 2304 items;
  • the sign is dropped on the floor as if it was completely emptied;
  • the leftovers simply disappear from existence.
• How many times did you recreate this bug?:
  • Quite a bit, but not under precise circumstances. At first I just noticed this happening when destroying a sign containing more than a full inventory of stuff. I tried to reproduce it many times with cheap stuff like sticks, but whenever I tried to do it on purpose while recording, it never happened, despite trying over and over again. When I was not recording, sometimes it happened, sometimes it didn't, and it really pissed me off that I couldn't grasp the reason. After the umpteenth time it happened, something snapped inside me and I realized that maybe it happens only when the leftovers are less than a full stack.
  • I tested this while making the video: firstly destroying a sign with more than 37 stacks (it didn't trigger the bug) and, immediately after, destroying a sign with just a couple items more than 36 stacks (bingo!). See the attached video.
    
  • After writing the most of this bug report, I decided to make a few couple tests again with sticks, just because. And... the bug happened every single time, but not only when the sign contained 36 point something stacks: this time it happened even if I placed much more than 37 stacks in the sign. Every single time. I feel like this bug is trolling me: when I think I understand why sometimes it happens and sometimes it doesn't, then it happens every time. Dafuq man, I'm done.
    
  • It started happening very recently: I'm not sure whether right after the 1.9 update or the 1.10 one, they were almost one after the other and I can't recall, but it surely never happened with 1.8 or earlier since I started playing on this server.
• Evidence:

 

When reading this, I thought "OH.MY.GOD: it makes perfect sense!"
But then I realized that my off-hand was empty during both attempts with spider eye (see the video): in the first the bug didn't happen, in the second it did.

 

Ouch, didn't see there was a thread already (despite I searched before posting, found nothing)

 

UPDATE: this happens even if you just collect stuff from the 2nd line with a right click, not just breaking the sign!
I just witnessed this (luckily, only with cobble). There were 2360 cobble blocks in the sign (2nd line), I just went to collect them and I got a full inventory of cobble, i.e. 2304 blocks, but the remaining 56 blocks just vanished: not in my inventory, not in the sign. I don't care of a few cobble blocks, but what if this happens with something much more valuable? What if this happens with a much bigger amount of items? Trade signs seem to be totally unreliable at this point, and this is a huge problem.
I'm tagging @andrewkm and @JamieSinn because this looks very serious, bug-free trade signs should be top priority in an economy server.

 

Ok sorry, didn't know there were so many reports on that, I knew only of another one and I couldn't find any reference to the fact that the bug happens even when just right-clicking