Water in Cauldron Totally Opaque and Black When Raytracing Enabled

Steps to reproduce:

• Enable raytracing mode.

• Prepare some cauldrons and some buckets of water.

• Fill those cauldrons with water.

• Dye them all and leave one untouched (the center one in the attachment).

Expected:

The water without any dye should be transparent.

Actually:

It becomes black and opaque.