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I at first time hear about influence of surfaces state on volume cracking. I have the own experiance: if sapphire to heat up to 300-500 C deg., and then drop in water — all volume will be cracking. The best surfaces qualty in micro-scale is “as grown” surfaces quality. This surface is atomic-smooth. Surface after polished to 60/40 is worse than “as grown” (in micro-scale). I don`t think that any etching is doing the surface better than “as grown” surface). I know this effect by heating 1100 C deg. (no cracking after heating and .... water) with SiC ceramics. But ceramics is not sapphire single crystal. Ceramics has the emptiness.
You can ask your fabricators to do the video of this process, but by this must be really sapphire crystals.