Error while parsing PHGR

[mprilepok]

I got error during parsing PHG parameter with letter on the end of the value

APRS Packet: b'PA0AGO-11>APRS,TCPIP*,qAC,FOURTH:@072239z5150.54N/00441.71E#PHG1230I/A=000012 RX ONLY! RAZ IGATE'
Traceback (most recent call last):
File "/home/pi/test.py", line 61, in
AIS.consumer(on_message)
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/inet.py", line 185, in consumer
callback(self._parse(line))
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/parsing/init.py", line 134, in parse
_try_toparse_body(packet_type, body, parsed)
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/parsing/init.py", line 209, in _try_toparse_body
body, result = parse_position(packet_type, body)
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/parsing/position.py", line 76, in parse_position
parse_comment(body, parsed)
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/parsing/common.py", line 118, in parse_comment
body, result = parse_data_extentions(body)
File "/home/pi/.local/lib/python3.9/site-packages/aprslib/parsing/common.py", line 196, in parse_data_extentions
parsed.update({'phg_rate': int(phgr[0], 16)}) # as decimal
ValueError: invalid literal for int() with base 16: 'I'

[wb2osz]

This is rather obscure, but it is valid.
Usually PHG is followed by exactly 4 digits.
There is a new form ( http://www.aprs.org/aprs12/probes.txt ) , that I don't think I ever observed before, where and an additional digit or upper case letter AND a slash can be added.
This specific example raises an interesting question. Would the following altitude be recognized?
PHG9999X/ would require the / to know that another character should be processed after the usual 4 digits.
We would not want the / to appear in the comment presented to the application user.
it seems to me that the following A=999999 would not be recognized as an altitude and would be considered part of the comment text.

Unfortunately the tocall field is "APRS" so we have no clue what generated this packet.

73,
John WB2OSZ