Bug of minecraft pocket edition 1.0.4.1

I used to have this issue before. When i break sand or gravel (any falling block) frame broken make more sand/gravel above fall. However it make a void block in place of broken block which let you see caves underground and structures there. This bug also affects 0.15.0 and later.

What are you doing to cause this to happen?

I get under blocks of earth jumping and park this

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