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This is in Cycles, sample count doesn't seem to affect anything.

I have 2 volume cubes, the rings only appear when both are enabled.

enter image description here

It only appears in the render, not the viewport. There is nothing in the compositor.

enter image description here

One of the volume cubes has variable density with a gradient texture and curves.

enter image description here

I tried all combinations of volume sampling and interpolation - no differences. I also experimented with the step rate and still nothing.

Blend File

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    $\begingroup$ Please provide blend file $\endgroup$
    – Chris
    Dec 21, 2021 at 8:52
  • $\begingroup$ The blend file is included now $\endgroup$
    – PNG-24
    Dec 22, 2021 at 0:25

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