Describe suggestion
Leaves and plants in general sway with the wind outside, but it is disabled inside (with no option to re-enable it). Some bugs happen when leaves or plants have special materials (with vanilla textures or custom resource packs), and the sway is supposed to be disabled.

The two layers would match their movement. Or there would be an option to enable sway indoors.

Screenshots
Sway indoors:


Sway outdoors:

This is not a bug and is intended. I will change the label and description into a suggestion.