Rendering Issue with Internal Faces

[WillRL]

Hi, currently I have a custom block that is essentially a water tank. Iron top and bottom with glass panes on the surrounding sides. Inside is full of water with a little TNT in the middle. (JSON FILE HERE). The code for it is currently very basic, just setting RenderType to be transluent in the client setup.

The block renders fine in the game, but at certain angles, the internal faces are not rendered. This is shown in the images below.

You can see that in the first image, the water is not rendered, then after moving slightly, it is rendered.

Any pointers in how to solve this would be awesome,

Thanks in advance.

- Will

[WillRL]

Bump?