Start of by placing a block with redstone on it. Then place another block diagonally (left one block, up one block/right one block, up one block) and place redstone on it. Finally, place a piston on top of the first redstone you just placed. You will see that the texture of the connection of the two redstone is shifted some pixels away.
EDIT by @unknown: It should be noted that functionally/server-side, the piston cuts off the wire, and the dust below the piston will power adjacent components like a normal plus-shaped dust (you can verify this by placing a redstone torch underneath the block the dust-that's-under-the-piston is placed on). The bug is that visually, the connected-upwards side texture appears, even though the dust isn't actually connected to anything. Also note that the piston cutting off redstone wire is intended - see MCPE-14910.
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Confirmed to affect 1.0.2 & 1.0.3. Renamed issue to be more descriptive and added some info to the description.
This bug still exists in 1.16.100.50. Not in the same way anymore, but it still there. Related to MCPE-35240. MCPE-35240 focuses on the technical issue of this.
@Tal: this bug does not occur anymore insofar as the vertical wire does not appear.
From the description and earlier comments it appears that at the time this report was made and resolved, the wire did not power vertically. So the behavior then was a visual wire connection without powering. The current behavior in 1.16.20 is opposite: powering without visual connection.
I can confirm that the redstone dust gets cut by the piston, but visually is still partially connected.