I re-appraised the sourdough I bought a couple of days ago. At the time I posted it I had tasted a slice and reported that it didn't have much sourdough flavour. What I did with that slice was toast it and buttered it.
Later, I buttered an untoasted slice and the sourdough taste came through no problem. Same loaf; same butter. I don't remember that difference between toasted and untoasted in any sourdough I've had before. Is that normal?