If the detector absorbs the wave then what's so strange about the interference pattern being destroyed? Wouldn't the absorption of the wave through 1 slit on the detector cause the the wave from the other slit to be out of phase and therefore not interfere?
Can someone please point me to an experiment (photons/electrons/whatever) where detectors were placed on both slits, this seems like a really big hole in the experiment if they stopped at having just the one detector. (Excuse the pun)