The same thing happened to my Titan. When I approach the shelves the prompt pops up to hold square (Ps5) to gather ingredients. It seems normal and makes the sound to indicate a successful action but nothing happens. The prompt pops up at the shelves again. I also tried on Hunter and Warlock, both work just fine and I could progress their quests. Maybe it's relevant information that my Titan was the only class that I maxed out on bounties before heading into the new episode.