The broker uses risk management, margin calls, market hedging, capital reserves and insurance coverage to ensure you always get your shares back. You're not really in any risk.
Capital markets are far bigger than you can imagine and unless you're holding millions of shares short (which is unlikely as a retail investor), it's not going to be an issue even with the most volatile penny stock.
In the miniscule chance that the shares are unable to be acquired for whatever reason, you would probably get reimbursed at the current market price, although I don't know the regulatory specifics around this and you should discuss the details with your specific broker.
Capital markets are far bigger than you can imagine and unless you're holding millions of shares short (which is unlikely as a retail investor), it's not going to be an issue even with the most volatile penny stock.
In the miniscule chance that the shares are unable to be acquired for whatever reason, you would probably get reimbursed at the current market price, although I don't know the regulatory specifics around this and you should discuss the details with your specific broker.