Hello !
On the new 0.62 expemirental update I found that the gas lamp has been fixed and now we can use it !
but I found a new bug with this one !
Put your gas lamp in your hand and turn it on then turned it off or/and put it in your inventory !
then turn the light on when this one is in your inventory ( not in your hand)
Then you can see the light will come where you place your lamp in your inventory or when you turned it off while it was in your hand !
bye !