Disco Party Lighting
 

Known Bug: Swapping light sources too quick can cause the game to flicker between them.

Step to Reproduce:
Large Lantern & Greater Lightstone
1. Place either in your secondary slot
2. pick up the other on the cursor
3. spam left click the first while it's in the secondary slot

It's possible to mess up other people's lighting if they're near you when you do it.

temp fix:
Zoning fixes it.

(I have no light source active in this gif, nor clicking)
https://i.imgur.com/LN5iDmE.gif