We never see the planet again
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Mustafar was shown in Rogue One, specifically Vader's Castle. It was also the planet at the very beginning of Rise of Skywalker where Kylo Ren slaughters all of those people and gets a holocron, or something.
There are approximately 3.2 trillion planets in the Milky Way, but there are apparently only like eight in that galaxy far far away.
I mean, that one in particular carries some extremely potent emotions for Ani.