**System Information**
Operating system: Linux-5.4.0-72-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.119.03
**Blender Version**
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-05-07 20:37, hash: `rB3185084efbe4`
Worked: (newest version of Blender that worked as expected)
**Short description of error**
Displacement in a shader on volumetrics starts to work only after connecting a shader into the surface output socket.
I do preview switching to an emission shader, but you can use any other shader in the surface socket and then disconnect it.
If you change any values, displacement will disappear again.
{F10064673}
**Exact steps for others to reproduce the error**
Open the file and reproduce the steps from the video.