Since the patch I've been seeing low level diggles appearing way further on in the game than they're supposed to. Attached is a screenshot of basic diggles appearing on level four, but I've encountered them (and other low level diggles) as far down as the RotDG expansion levels.
Er, it's not a bug. It's how some room layouts are designed. Diggle Nests with diggles can spawn on any floor, I believe. I've seen then many patches ago as far down as floor 7. There's also the hopping isle room where you have to hop across using a teleport skill or you're stuck, or blow up the walls, with nukes, , Those will always have diggles in them, and can spawn on any floor. IF you found diggles wandering the hallways on their own, then yes, that would be a bug, but first, you have to see if there's any rooms nearby that match my description.
OK 1.) I'm not talking about just diggle nests and other rooms with predefined monsters 2.) Higher level diggle nests generally have higher level diggles 3.) This never occurred before the patch 4.) I've only ever seen the "hopping isle" room on floor 4
Well, you don't have to be mean about it. I've never run into this particular issue before. And I've seen Diggles in Diggle nests all the way up to Floor 10 before. Yes, there were Arch-Diggles there, but normal diggles too. I thought you were experiencing what I have seen. I was wrong.