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Well the bug is that if you make dirt wall hallowed, u will get jungle wall which causes that jungle key molds Drops rather than hallow ones. Also i think because of this, gastropods are sometimes spawning in the underground jungle.
I have actually had glitches like this. Gastropods are randomly spawning in my underground jungle, and also, because there was an area with a lot of dirt wall that was converted on the entrance to hardmode, the game thinks it is a jungle.