You can't place a cactus next to redstone dust, but you can do the opposite without breaking the cactus.
Steps to reproduce:
Place a cactus on sand.
Place a redstone dust next to it.
Power the dust and see the cactus breaks.
What I expected:
Either cactus breaks when you place a dust, or
Cactus and redstone dust can be placed next to each other. Dust does nothing to cactus, regardless of whether it's powered or not.
I think (2) is the correct behavior because redstone dust is not solid.
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@Luis Robles Yes, but it might be that cactus blocks look for adjacent block updates, and powering redstone counts as a block update.
I think what is going on is that:
MCPE curently doesn't allow cactus to be placed adjacent to a redstone dust (which is itself wrong).
But when a dust is placed next to cactus, it doesn't immediately notice that via block update triggered by the placement.
When the dust is powered, it triggers another block update to cactus and this time it notices the existence of dust.
I'm not sure whether it's a bug or it was intended to do so. If i'm not mistaken, it has been in the game since 0.13.0 (first release of redstone in mcpe) and it has been used for redstone alternatives them.
I am afraid we can not reproduce this bug in the recent version. Please update affected versions if this bug still occurs.
You are right, according to the Wiki: " Cacti can only be placed either on sand, red sand, or on other cactus blocks, with no horizontally adjacent solid blocks"
Source:http://minecraft.gamepedia.com/Cactus