I don't know if this helps but I think one of the contributing factors is having geometry that's listed in the 'Object to VDB' operator used in a Skin Wrap or tyConform(Temporal) modifier eslewhere.
If I keep re-rendering the same frame, the skin-wrapped geometry either vanishes or will randomly move/scale.
If I keep re-rendering the same frame, the skin-wrapped geometry either vanishes or will randomly move/scale.
