Spore blossom gets darker when next to a block with smooth lighting enabled

The Bug

When you place a block next to the spore blossom, one of the petals get darker.

Reproduce

• Ensure that you have smooth lighting set to either "minimum" or "maximum" in your video settings.
• Build the setup as shown in the attachment below. setup.png
• Take note as to whether or not spore blossoms get darker when blocks are placed beside them whilst smooth lighting is enabled.

Observed Result

Spore blossoms get darker when blocks are placed beside them whilst smooth lighting is enabled.

Expected Result

Spore blossoms would not get darker when blocks are placed beside them whilst smooth lighting is enabled.