If the player picks up armor while within a chest GUI, the armor won't be rendered

[sleirsgoevy]

Client version: 1.8.9
Server OS: Linux
Cuberite Commit id: 4fe144d

Expected behavior

The player picks up armor while being in the chest GUI. The armor renders in their inventory and on their avatar.

Actual behavior

The player picks up armor while being in the chest GUI. The armor slots in the inventory still appear empty, but trying to move an item from there makes the armor show up, thus this is a desynchronization issue.

Steps to reproduce the behavior

1. Open a chest with any player in survival mode, and stay in the GUI
2. Use a console command or another account to give a piece of armor to the player

Server log

Irrelevant.