Did I find a loophole in Coinbase unstaking times?

I'm new to ETH and maybe I'm missing something, but unstaking on Coinbase's exchange has an absurd 15 day wait, but if I wrap it with cbETH, send it to my Coinbase wallet, then unwrap it, I get the ETH instantly!? Is there any downsides to doing this? I can think of a downside to not doing it: Coinbase doesn't pay rewards during the unstaking time, with the exception of the first day.

Basically, I want to move all my staked ETH from my Coinbase exchange onto Coinbase wallet, unstake it, and then stake it again with Rocket Pool.