That's how royal titles can work (merge with the Crown until reassigned), but not Royal patronages. They're not things that the Crown owns
Well, if they're official royal patronages, they kind of do.
This is from the official announcement from BP last February.
The honorary military appointments and Royal patronages held by The Duke and Duchess will therefore be returned to Her Majesty, before being redistributed among working members of The Royal Family.
Also this.
A decision has now been made after conversations between The Duke of Sussex and Members of The Royal Family.
The military, Commonwealth and Charitable associations which will revert to The Queen are:
The Royal Marines, RAF Honington, Royal Navy Small Ships and Diving.
The Queen's Commonwealth Trust, The Rugby Football Union, The Rugby Football League, The Royal National Theatre and The Association of Commonwealth Universities.
No mention of Smartworks or Mayhew. Because they are not royal patronages.
www.royal.uk/buckingham-palace-statement-duke-and-duchess-sussex