There is currently locked staked ETH (stETH) on the Beacon Chain. stETH is backed 1:1 by Ether (ETH). However, developers have confirmed that users will not be able to withdraw their locked stETH after The Merge. Withdrawal of stETH will instead be possible after the Shanghai Upgrade- the next major upgrade after The Merge. Therefore, users should expect their assets to remain locked and illiquid for at least 6-12 months after The Merge.