A kind of gray plane appears below player in oculus quest 2

Hello, i am doing an VR project, i encountered a problem that never happened in testing Unity. It's in Oculus quest 2, it shows me a sort of square and gray plane below the player, and it's only when i bends down that it appears, is there anyone who has encountered the same problem?

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Hey there, can you file a bug so the team can take a look? Thanks!