Wasn't this later changed so that only the House can originate appropriations?
The Connecticut Compromise was to give States equal representation in the Senate, which favored small states.
In exchange, money bills would originate in the large state dominated House of Reps. For a week or so, the Senate was prevented from modifying the bills, but could only vote up/down. That changed and became what we have today; House origination but the Senate can modify.
This is what Mason protested. He didn’t want the Senate to be able to modify money, i.e. appropriations bills.