I think I got it now. There's distributor, distributor transport, and testing. The documents below don't say anything about restrictions on manufacturer and distributor being held by the same licensee. Only lab testing is the one thats restricted from having any other license. I think the key is in the definition of what the license for distributor and transport means.
Distributor: Is responsible for transporting cannabis goods, arranging for testing of cannabis goods, and conducting quality assurance review of cannabis goods to ensure they comply with all packaging and labeling requirements.
Distributor transport: Allows a licensee to transport cannabis goods between licensed cultivators, manufacturers, and distributors. A licensee may not transport cannabis goods to a licensed retailer and may not engage in any other distributor activities.