When I converted an old world type into infinite after the Caves and Cliffs part II update dropped, the outer edge of the world either reset to match the new terrain or was raised a few blocks. I had made a copy of the world beforehand in case something like this happened, but the old world also reset the outter sections of the world. (I don't have any screenshots of the world before the update)
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We're tracking this issue in MCPE-148990, so this ticket is being resolved and linked as a duplicate.
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I hope they change this so Old type chunks are exceptions to being affected by biome blending. Same problem like this on all my Old Types. Hope certain things like this get patched. Thank you for your collective hard work on this update though!