Simple answer is it sucked up some weeds and the transmission oil cooler is clogged. Easy fix, and something a person should do as preventive maintenance a couple times a season.
And yes, you can start a boat out of water and not see any immediate issues, but this will catch up with you with shortened impeller life and potentially an overheated boat on the water.
TIRE & WHEEL SALES
Two 14" Aluminum wheels $195
Two 15" Aluminum wheels $215
Four 14" Aluminum wheels $370
Free Freight within lower 48
Steel and galvanized wheels available. Spare tires too.