After your crystalline aura runs out, the UI is not updated automatically, but will update after a game restart.
Some examples:
The silver cost for triport fees still show up as 0 silver although it actually costs silver.
Crystal Benefactor title still usable.
Crystalline Aura icon in the top left menu bar is still green.
I didn’t check/confirm the ocean liner 50% off fee still displaying, but that might also be a possibility.