I need context
Its been fixed for a while, just not on live servers.
I'm curious as to whether you forgot about The Lost Tower
Do you remember which parts and how quickly they skip automatically? I was fairly sure I removed that or made the auto-skip like 20 seconds.
As I said, easter egg. There's no discovery or xp or anything gameplay-affecting locked behind the ending.
I like to think of the second ending as an easter egg, not the 'right' one, since only one cutscene actually changes.
Were you playing the quest Mushroom Man just before?
To escape the skylight at the end of the cave?
Can you describe exactly what you did prior to this happening?
What does your quest book say? What happens if you re-enter the cave?