As with every shrine in the game, there’s a simple additional puzzle in both Shee Vaneer and Shee Venath: a bonus chest with useful loot.
In keeping with the ‘Twin Memories’ theme, each chest is hiding in essentially the same place in both shrines: if you ride the moving platform up to the observation platform, you may be able to see a ledge behind the wall closest to the platform (as in the screenshot above).
Accessing the ledge – and the treasure chest – is a simple matter of jumping, deploying your glider and doing a leisurely U-Turn as you descend.