The emissive animation of firefly bushes isn't interpolated

The Bug:

The emissive animation of firefly bushes isn't interpolated.

This makes the emissive animation look jittery and harsh. If we look at another animated block such as magma blocks, we can see that the animations are interpolated which makes them look smoother and neater.

Steps to Reproduce:

1. Place down a firefly bush and watch its emissive animation.

Observed Behavior:

The emissive animation isn't interpolated.

Expected Behavior:

The emissive animation would be interpolated.