So I just caught a 634CP Venonat, and there was much rejoicing.
This was recorded in my journal for future generations to view and marvel at:
I immediately hit Evolve on it, because it was fragging strong and I had enough candies.
It then proceeded to vanish into stray electrons. It's not in my Pokémon collection, it's not turned into a Venomoth, it's not re-integrated itself Dr. Manhattan style after restarting the app multiple times. I am 100% positive I didn't send it to the Professor to be ground into Torgo's Executive Powder.
Has anyone hit this particular bug before? Should we just chalk this up to a weird edge case and curse the gods?