I was making a doghouse for my wolves in survival when I was placing stairs I placed one incorrectly. I broke the stair block and during that it changed a different texture, the middle part was a mix of acacia wood and dark oak wood stairs.
I couldn't get a picture because the glitch only happened when I broke stairs.
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Confirmed.
Video Attached.
Reproduction steps:
Place stairs,
Mine them in survival.
Notice odd texture

Same thing happens with pistons (1.7.0.7)

Confirmed for 1.7.0.9 beta.

Thank you for your report!
However, this issue is a Duplicate of MCPE-32907.
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This also happens to me. I think it shows what you're destroying.