Seriously though, plastics is tasteless. So the taste isn't coming from the plastic. It's coming from other chemicals used in the coating/curing process, my best guess is formaldehyde or something similar. Since it's clearly a chemical taste, it's not only unpleasant, but most likely unhealthy. It also literally interacts with your nervous system causing mild numbness. Is it going to kill you? Probably not. But of all the questionable things you could ingest, this is at least avoidable.
Even as an ignorant kid in the 70s, I recognized that whatever was coming from these reeds was not a good thing. I didn't play them for long. Since it's been over 50 years, and they still taste funny, I won't be playing them again.