(I only play on windows, so I don't know if this is a bug on any other devices)

Prior to the Flames Of The Nether update, besides having "fake" secret levels, I found out that when I play a secret level, which in this case was Soggy Cave, at the end when I returned to the boat, there was a victory.

But that's not the point, so keep reading.

Usually, Soggy Swamp says "You destroyed the Cauldron! The Illager's Potion Supply is no more!" like that. But in Soggy Cave, the level doesn't contain the boss fight of the cauldron, despite saying that you destroyed the cauldron.

I also saw a bug on Social Media that, at the end of Creepy Crypt, when you open the gate, there are subtitles and the voice of "You saved the villagers!", where that belongs to Creeper Woods, not Creepy Crypt.