Wonders Expire?

The game still says the Colossus becomes obsolete as soon as any player discovers navigation. Can anyone confirm that actually happens?
 
The game still says the Colossus becomes obsolete as soon as any player discovers navigation.
It's weird that it's the only one that does. The Colossus would still be one of the worst wonders even if it lasted until the end of the game.

It also appears that the Great Wall goes obsolete when somebody discovers Construction, but that may be a bug.
 
Stock Exchange takes almost the same time of a wonder to be built.... I wonder why it isn't considered a wonder...

Imagine if there could only be one Stock Exchange in the game and you didn't get it.
 
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