Is something wrong with rare spawns at the moment? (Pyzjn)

[spectrefax]

Been camping Pyzjn on and off for a couple weeks using the Pyzjn camping guide on the wiki. I've farmed her successfully before and looted a few Glowing Black Stones before, however, I've only seen her pop once in the last 20-30'ish nights (in-game) I've camped her. This is well, well, well below the spawn rates I've seen from her previously. Has something been changed with rare spawns that I'm not aware of?