The underside of a spore blossom is rendered too dark when held in your hand or dropped as an item

The Bug:

The underside of a spore blossom is rendered too dark when held in your hand or dropped as an item.

Steps to Reproduce:

• Hold a spore blossom in your hand.
• Toggle your perspective twice. (Hit F5 twice).
• Look at the underside of the spore blossom.
  →  Notice how the underside of a spore blossom is rendered too dark.