#905 Some gems gain extraneous 'materialtype mercury'

[Kevin Zheng]

A few players found that some gems, including emeralds, sapphires, and rubies, sometimes gain an extraneous 'materialtype mercury", which prevents them from stacking with normal gems.

This problem happens with emeralds, sapphires, and rubies, but apparently not diamonds. Pearls suffer from a similar issue, where some of them are made of granite, and some of them have no material type set.

Steps to reproduce are not yet known. I suspect an issue in the 'materialtype' save/load code.

Server: invidious (v1.75.0-329-g7d35005)