I can't be the only one to have noticed this bug, but I thought I'd submit some screenshots highlighting it. Note that this bug occurs upon logging out; the lights are absent upon logging back in. Placing the item in your inventory and putting it back out always restores the light effect.
Here you can see two identical enchanted lights, yet one is working and one is not (notice the smaller plant between the large ones is also not working.

Here you can see that all the enchanted lights in this particular corner are bugged out except the Coldharbour Glowstalks tucked in the right corner.

Particularly strange, here are two enchanted light in essentially the same spot, yet one is working and one is not.

This is the same spot with the Welkynd Stone removed...

... and this is what the Lunar Cactus
should look like.

There are obviously more important bugs than need fixed at present, but I still believe that this bug with enchanted lighting is important and should not be ignored, especially considering that the Hall of the Lunar Champion is a major part of the Elsweyr expansion and the Year of the Dragon in general.
Cheers!
The Exclusionary Mandates of Maruhkite Selection: All Are Equal
1: That the Supreme Spirit Akatosh is of unitary essence, as proven by the monolinearity of Time.
1: That Shezarr the missing sibling is Singularly Misplaced and therefore Doubly Venerated.
1: That the protean substrate that informs all denial of (1) is the Aldmeri Taint.
1: That the Prophet Most Simian demonstrated that monothought begets Proper-Life.
1: That the purpose of Proper-Life is the Expungement of the Taint.
1: That the Arc of Time provides the mortal theater for the Sacred Expungement.
1: That Akatosh is Time is Proper-Life is Taint-Death.