Pumpkins are not in-season right now (also the wiki does track these removal messages, so I will say an actual reason: the idea creator wants it to be temporarily removed until the effect is reworked)

Author: MathIsFun0

items/misc_joker.lua

@@ -7949,8 +7949,8 @@ local miscitems = {
 	exposed,
 	mask,
 	tropical_smoothie,
-	pumpkin,
-	carved_pumpkin,
+	--pumpkin,
+	--carved_pumpkin,
 	cookie,
 	necromancer,
 	oil_lamp,