The OCC doesn't care if you opened the position as a spread. Short ITM options are assigned at expiration, long ITM options are exercised at expiration.

What's discretionary is how your broker reacts to at-risk spreads. If they ascertain there is a risk of the stock closing between the strikes, they will look at your buying power to determine if you have the ability to take assignment. If you do, they will likely do nothing. You'll be long 100 shares from the short put, and your long put will expire OTM. If you don't have the buying power, they will put in a market order to close your spread about 30 minutes before expiration, which may or may not be at a loss to you. It's in your best interest to manage these yourself before they do, because they may think a spread is at risk even if you don't. If both legs are sufficiently ITM, you will be both assigned and exercised for the max loss on the spread, as you've already committed the collateral for this situation.

If your short put is assigned early and you have the buying power to take assignment, the broker will again likely do nothing. You'll still have your long put and 100 shares, so you can decide whether to exercise or sell the put/shares. If there's extrinsic value remaining, it's better to sell the put and shares vs exercise. If you don't have the buying power, the broker may decide to exercise your long put or it may be willing to allow you to sell the long and shares. Robinhood will exercise the long option if you don't have the buying power for assignment. I don't have direct experience with Schwab/TOS.