It appears that if you have redstone wires with water next to them and lava on top, they turn into obsidian. This probably isn't intended, but I was wondering why this happens, and if there is anything else redstone wire can be transmuted into.
Looks like this mystery was solved on Reddit. Should we reopen the question and list this as an answer since its solved now? I'll have to test to see if this bug is still in the current version or not.
[Edit] From Reddit: [–]Glurak 42 points 1 year ago
Ok, I tested it. And here is some science to it. Some blocks in mc world have additional data value, like color of the wool, direction which rails are curved, length of water stream, current in redstone wire and such. When water(and lava) is still, that number is 0. If it flows, it is 1-7 (distance from source), when it falls, it is 8. In case of redstone, the additional data value is about the distance from power source, while 0 is out of power, 15 is next to power source. Soo, if you want obsidian, you either need still lava (ad.data value 0), or redstone out of power (ad.data value 0). If redstone is powered, you get cobble (ad.data value 1 to 7) or nothing (8 to 15). Why the hell can redstone dust be replaced with lava, I don't know, it have to do something with the order in which mc_physics/redstone/fluids/etc updates in minecraft or something. But it works only for redstone dust. I tried other things that have additional data value (like rails, torches, crops, etc) but nothing had the effect.
Pressure plates works as airlocks. I forgot to mention. In case of airlocks, lava won't try to replace that block, thus that glitch of mixing additional data values from the old block(r.wire) and block id from the new block (lava) won't even have a chance to occur. [/Edit]