Well actually I'm using 0.13.1 but there isn't this option.
In MCPE, a redstone dust "connected to nothing" automatically points to all four adjacent blocks, but in my pictures some adjacent blocks which are pointed to doesn't seem to be actually powered.
To reproduce this situation, place a redstone dust pointing to a block in any direction. As the world is made of blocks, now there is a row of blocks in which both the block and the redstone dust is in the row. Power the redstone dust with a block or a redstone torch which is adjacent to the redstone dust but is out of that row. Test if the first block (pointed by the wire) is powered and you will find that it is not.
I'm afraid this can't be explained clearly so in the screenshots below there are several situations in which the bug occurs.
The bug happens in different directions, so I wonder if the code about checking which directions a redstone dust points to is incorrect.
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"Duplicate" of MCPE-11353

But wait, the screenshots
[media]and
[media]provide something new to MCPE-11353. Given the fact that apparently duplicating MCPE-11871 turned out to be a different bug, I think it's safer to mark this Related to, not Duplicate of MCPE-11353.

But wait, the screenshots
[media]and
[media]provide something new to MCPE-11353. Given the fact that apparently duplicating MCPE-11871 turned out to be a different bug, I think it's safer to mark this Related to, not Duplicate of MCPE-11353.

Well sometimes the dust powers more blocks than supposed. I'm thinking it's the same bug.

Well sometimes the dust powers more blocks than supposed. I'm thinking it's the same bug.

I don't think so. It's a separate glitch MCPE-11668.

I don't think so. It's a separate glitch MCPE-11668.

Well it's only that I suppose they occur because of the same reason and thanks for pointing it out.

Well it's only that I suppose they occur because of the same reason and thanks for pointing it out.

Fixed in 0.14.0 alpha.

Fixed in 0.14.0 alpha.