It's something to be aware of, the thread OP was updated & yes it can still happen, it's not meant to, it will likely take hours to sort out, the person reversing the deposit is effectively stealing the money from the bank & not you, but you may get tared with the same brush though as the bank may suspect you of doing something that attracts dodgy scammers, ie selling irreversible crypto for cash deposits which they may argue is not something they like you to do with a personal account or even a business one for that matter so they may just shut down your accounts anyway. Solution, to wait one day = np.
Sure in theory it can happen, but the bitcoin-broker system and procedure prevents this from any ill effect and protects all parties.
Copies of the receipt and information of the teller including their phone number accepting the deposit are recorded. If a bank violates its procedure, and a harm is suffered from a bank processing the fraudulent reversal, the bank is strictly liable.
So not only would any issue like this be swiftly resolved, it could turn into the proverbial "bank error in your favor" due to the banks liability in the matter.
Banks are insured for this sort of thing, but the tiny amounts transacted through this service wouldn't reach the deductible.
The fraudulent depositor who did so under camera has the biggest risk here, probably not worth it for a scammer.
tl;dr - I hope it happens to me.
