(SPOILER)
So... I have finished the quest where you find Virgil in the Glowing Sea and kill the courser and take his chip, I went back to the memory den, and I just fell through the ground, I reloaded a save 3 hours back and the same thing happened after I did the same quest AGAIN. I have played Fallout since 2010 so I know that Fallout is filled with bugs I hope this gets patched soon because I'm not starting the game again when I have 40+ hours. I've also looked on the Fallout Reddit, the support forms, contacted Bethesda, and got fuk all from all of them. :/