In the movie Star Wars: The Rise of Skywalker, Rey fights the Dark Side version of herself inside the wreckage of the Death Star. This fight is similar to how Luke Skywalker fought the Dark Side version of himself inside the cave on the planet Dagobah in the movie Star Wars: The Empire Strikes Back.
I am wondering if there is an in-canon explanation as to why Rey did not encounter the Dark Side version of herself while she was inside the cave on the planet Ahch-To. Since the cave was a place that was very strong with the Dark Side of the Force, it should have shown her what she was capable of becoming which would be a Sith Lord like her grandfather Sheev Palpatine/Darth Sidious, and she should have had a lightsaber battle with Dark Side Rey inside the cave.
Why didn't Rey encounter Dark Side Rey inside the cave on the planet Ahch-To?