label nBufferLayers in dynamicRefineFvMesh produce no diffence

Summary

There is no working option to increase buffer layers between refinement levels.

Steps to reproduce

In tutorial multiphase/interFoam/RAS/motorBike , that is using dynamicRefineFvMesh, increasing label nBufferLayers from 1 to 2 or more does not bring any difference.

Example case

With nBufferLayers 3;

Environment information

• OpenFOAM version : v2112
• Operating system : Ubuntu 18