Reasons:
1. it doesn't seem right being able to take advantage of things, like popping treasure boxes behind a mist gate / utilizing the split bullets of the charge attack to hit out-of-reach ghost blocks and switches.
2. it is extremely annoying in places like IMF making it almost a not to be used weapon for there. As well as other places.
3. It could be much like the charged bullets of a neutralizer / catalyzer. They have an effect when used on an enemy. When used on a switch etc. they stop and do not activate the switch / break the block.
So basically make alchemer splits work similar to catalyzer charged bullets in the way that they do not destroy blocks / hit switches.
I don't think this is really nescessary =/...
1. You can't take too much advantage from it. boxes behind gates may be destroyed but it's content will never be accessible without actually opening the gate.
2. I have prismatech, and I never really had a problem in IMF (neither in any other places).
3. That'd be an easy way to "fix" it... could work, I guess
IMO the alchemer line is a bit underpowered, this would harm it even more >.>