Not a valid Callsign

[vetsin]

New to APRS and trying to decipher the format, but the following is throwing exceptions (picked up via r/33/-97/200 t/p:

     def test_weird_frame(self):
         frame = 'DL0II>APRS,TCPIP*,qAC,T2MAZURY:=5115.19N/00658.49E&www.r09.de APRS iGate'
         aprs_frame = aprs.Frame(frame)

With the trace:

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ERROR: test_weird_frame (tests.test_aprsframe.FrameTestCase)
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Traceback (most recent call last):
  File "/home/vetsin/Projects/aprs/tests/test_aprsframe.py", line 103, in test_weird_frame
    aprs_frame = aprs.Frame(frame)
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 87, in __init__
    self.parse()
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 120, in parse
    self.parse_text()
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 142, in parse_text
    self.path.append(Callsign(path))
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 258, in __init__
    self.parse(callsign)
  File "/home/vetsin/Projects/aprs/aprs/classes.py", line 293, in parse
    self.callsign.encode('hex'))
BadCallsignError: ('Could not extract callsign from %s', '54324d415a555259')

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Far as I understand the protocol thus far station DL0II received a verified qAC from an 'invalid' callsign. Are we okay with not validating >= 3x2, 3x3 callsigns?