I completed an Echo and had an item I couldn’t pick up off the ground for some reason (had amostly empty inventory). I Then left the echo and wanted to make sure I could pick items up, so I dropped an item. Prior to this, I put a ring in my stash. I dropped the other item, picked it back up and the ring I had put in my stash appeared in my inventory, it was also still in my stash.
Here’s a clip from the stream: Twitch