I think it's just a bug of metamask, you don't need to worry as long as your token is still visible in BSCScan.
My advice is to import your private key into a trustwallet or other wallet that supports multiple tokens without having to manually add custom tokens.
What you said is also a good solution for the OP to try, because as long as the coins and assets in the bscscan are still there, no problems will occur and there is no need to create unnecessary panic because the assets are also not lost.