Resource pack "shadows.material" file is unresponsive

In the vanilla resources, there's a file that's named "shadows.material". In 1.16.40, this file is used to render entity shadows. In both 1.16.100.59 and 1.16.30.53 RTX however, this file does nothing.

Steps to Reproduce

1. Download the pack named "Entity Shadow Removal" (attached below)

2. Load into either 1.16.100.59 or 1.16.30.53 RTX

3. Spawn a mob, throw out an item, or something else that creates entity shadows

Here, the pack doesn't work as it does in 1.16.40, which is to stop entity shadows from rendering. 

Video Example

https://youtu.be/kFSgcdHZs2Q