This one its and old one, i think since at least A2. The problem its that there is no check for the glasses that you select on your profile so it lets you to have some inesistent glases when joining a server. Even if you join with a unmoded client to a unmoded server with, if the profile has stored a non existen glass name it will trigger.
It ends with terrible conquenses sometimes:
https://www.youtube.com/watch?v=5hQ1GIxDwWM