I am currently listening to an audiobook reading of Keats poetry by Sir Ralph Richardson, and I have noticed a peculiar pronunciation of adjectives ending in -ed. While I have heard in the past certain words like winged being pronounced as wingid rather than wingd, I thought it an archaic peculiarity of a small subset of words. Yet today I have heard Sir Richardson pronounce stained in the same odd fashion, as steinid rather than the overwhelmingly more common steind. It has made me think and wonder whether this oddity is some sort of literary remnant from the past, or perhaps just a mistake from his part.
For copyright purposes I cannot link to the recording, but if I haven't made myself clear, you can hear what I'm talking about in this publicly available reading of Annabel Lee by Poe.