I'm a player on a Minecraft-Server that uses LWC.
A friend of mine discovered a bug where he was able to open locked chests by holding the right mouse-button and spamming the shift-key (while holding an item in his hand). I later confirmed that this was possible for me, too.
The Server is on version 1.12.2 and uses Factions, MCMMO, Diesease and Brewery (there may be more plugins that I am unaware of).
I don't know if one of the server's other plugins causes this bug.
Please try to fix this problem asap.
Thanks