Currently, I am trying to gather Glimmer Mushrooms and the Geode Rocks no longer appear to be dropping them.
I'm not maxed out on them, I still have storylines open that require them and they're dropping as expected from every other known source in the game. it's just the Geode Rocks that aren't giving them any longer despite the inventory card saying they should drop.
I chopped 30 Geode Rocks over the last few days (600 chops total) and did not get a single Glimmer Mushroom. I was going to open a ticket, but after asking around, other players also noted that they were not getting the Glimmer Mushroom from the Geode Rock.
To me, this seems like it's not something specific to my game but a general bug that needs looking into.