Using UE 5.5.1 and Substrate. Rendered with the Path Tracer through movie render queue. Modeled in Houdini.
The outer glass was modeled with thickness.
Inner liquid is single-sided.
Substrate glass for closed meshes like in this example with a light bulb.
Very simplified version of my master material for glass.
Outer glass material instance parameters.
Inner liquid material instance parameters.
Parameters you should enable in your glass master material.