When you place any type of leaves on top of a pot including decorated pots and you look in side there is some flicker going on when you move or not. The pot and the leaves block model into each other making this. It can also happen with other blocks that can be seen though or not.

It works with:
• Acacia Leaves
• Azalea Leaves
• Birch Leaves
• Charry Leaves
• Flower Azalea Leaves
• Jungle Leaves
• Mangrove Leaves
• Oak Leaves
• Spruce Leaves

Tip:
If you don't  understand what I sad watch the videos.