why does yield get skipped when using send method

Question

guests = ["Tim,22",
"Tonya,45",
"Mary,12",
"Ann,32",
"Beth,20",
"Sam,5",
"Manny,76",
"Kenton,15",
"Kenny,27",
"Dixie,46",
"Mallory,32",
"Julian,4",
"Edward,71",
"Rose,65"]

def read_guestlist(file_name):
  while True:
    for person in guests:
      name, age = person.split(",")

      new_guest = yield name
      if new_guest != None: 
        new_name, new_age = new_guest.split(",")
        name = new_name
        yield "This never gets printed"
        yield new_name

guestlist = read_guestlist(guests)

counter = 0
for name in guestlist:
  if counter == 5:
    guestlist.send("Jane,35") 
    counter += 1 
  elif counter == 10:
    guestlist.send("Pontus,35")
    counter += 1
  print(name)
  counter += 1
  if counter > 17:
    break

I have been playing around with this code for a while, and each time I have sent a value using send one yield gets skipped. In this case it is the yield: yield "This never gets printed". My question is: why does that particular yield get skipped each time I use send method?