Yeah I’m seeing the same problem, just with the Add and Multiply nodes alone. Trying to drag an axis from the default ‘Mouse Y’ node to an ‘Add’ or ‘Multiply’ node gives “No matching ‘Add’ function for 'Float (Single Precision)”.
This should probably be hot-fixed or something, because this one’s kinda bad .
Update: As a workaround, you simply need to add your operator to the graph, then convert one of the pins to your desired type, THEN connect whatever you’re trying to connect. Seems to work.