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Because when the Enterprise-C went back through the rift, it corrected the timeline to it's rightful flow, save for Tasha Yar. If you'll remember, when the 1701-C entered the rift in the first place back in 2344, it created the alternate timeline in which the 1701-D was a battleship instead of an explorer. So, when the C goes back through the rift to set time straight, the only crew member who had any knowledge or memory of the events was Guinan.

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