Steps to reproduce:

1. Find a lake, ocean or build a pool;
2. Place a glass block on the surface, in a way that the top of it is still dry;
3. Enter the water;
4. Enable third person view in a way that you're underwater but the camera isn't;
5. Look at the glass block.

Expected result:

The glass renders the water texture underneath it, just like it'd happen normally.

What actually happens:

The water texture is invisible, just like when the glass is seen from the first person perspective.