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AT^SCFG? query takes too long to reply and breaks Cinterion EGS5

Testing with a EGS5 and MM git master:

ATI
Cinterion
EGS5
REVISION 01.000

Querying AT^SCFG=? returns right away:

AT^SCFG=?
^SCFG: "AutoExec",("0-1","0-1","0-2","0-255","120","000:00:05-240:00:00")
^SCFG: "Call/ECC",("0"-"255")
^SCFG: "GPRS/ATS0/withAttach",("on","off")
^SCFG: "GPRS/AutoAttach",("disabled","enabled")
^SCFG: "GPRS/PersistentContexts",("0","1")
^SCFG: "GPRS/RingOnIncomingData",("on","off")
^SCFG: "MEopMode/Airplane",("on","off")
^SCFG: "MEopMode/Airplane/OnStart",("on","off")
^SCFG: "MEShutdown/OnIgnition",("on","off")
^SCFG: "PowerSaver/Mode9/Timeout",("5-36000")
^SCFG: "Radio/Band",("1-15","1-15")
^SCFG: "Radio/CNS",("0","1")
^SCFG: "Radio/OutputPowerReduction",("1","2","3")
^SCFG: "Serial/USB/DDD",("0","1"),("0"),(4),(4),(4),(63),(63),(4)
^SCFG: "Tcp/BufSize",("3000-20000")
^SCFG: "Tcp/IRT",("1-60")
^SCFG: "Tcp/MR",("1-60")
^SCFG: "Tcp/OT",("1-6000")
^SCFG: "Tcp/SAck",("0","1")
^SCFG: "Tcp/TTcp",("0","1")
^SCFG: "Tcp/WithURCs",("off","on")
^SCFG: "Trace/Syslog/OTAP",("0","1")
^SCFG: "Userware/Autostart",("0","1")
^SCFG: "Userware/Autostart/AppName",("0-100")
^SCFG: "Userware/Autostart/Delay",("0-10000")
^SCFG: "Userware/DebugInterface",,,("0","1")
^SCFG: "Userware/Passwd",("0-8")
^SCFG: "Userware/Mode",("normal","debug","test"),("0-126"),("0-65535")
^SCFG: "Userware/Stdout",("ASC0","ASC1","USB","FILE","UDP","NULL"),("1-65535"),("0-125"),("buffered","secure")
^SCFG: "Userware/Watchdog",("0","1","2")
^SCFG: "URC/CallStatus/CIEV",("restricted","verbose")
^SCFG: "URC/CallStatus/SLCC",("restricted","verbose")
^SCFG: "URC/Datamode/Ringline",("off","on")
^SCFG: "URC/Ringline",("off","local","asc0")
^SCFG: "URC/Ringline/ActiveTime",("0","1","2")

OK

But then, querying AT^SCFG? does something very very strange. The modem replies a first chunk of information, with the "GPRS/AutoAttach" line not fully written:

AT^SCFG?
^SCFG: "AutoExec","0","0","0","0",""
^SCFG: "AutoExec","0","1","0","0","","000:00:00","086:28:15"
^SCFG: "AutoExec","0","1","1","0","","000:00:00","086:28:15"
^SCFG: "AutoExec","0","1","2","0","","000:00:00","086:28:15"
^SCFG: "Call/ECC","255"
^SCFG: "GPRS/ATS0/withAttach","on"
^SCFG: "GPRS/AutoAttach"

And after a while (99.6 seconds later) we end up receiving the remaining part of the response:

,"disabled"
^SCFG: "GPRS/PersistentContexts","0"
^SCFG: "GPRS/RingOnIncomingData","off"
^SCFG: "MEopMode/Airplane","off"
^SCFG: "MEopMode/Airplane/OnStart","off"
^SCFG: "MEShutdown/OnIgnition","off"
^SCFG: "PowerSaver/Mode9/Timeout","20"
^SCFG: "Radio/Band","15","15"
^SCFG: "Radio/CNS","0"
^SCFG: "Radio/OutputPowerReduction","3"
^SCFG: "Serial/USB/DDD","0","0","0409","1E2D","004F","Cinterion","EGS5",""
^SCFG: "Tcp/BufSize","5200"
^SCFG: "Tcp/IRT","3"
^SCFG: "Tcp/MR","10"
^SCFG: "Tcp/OT","6000"
^SCFG: "Tcp/SAck","1"
^SCFG: "Tcp/TTcp","0"
^SCFG: "Tcp/WithURCs","on"
^SCFG: "Trace/Syslog/OTAP","0"
^SCFG: "Userware/Autostart","0"
^SCFG: "Userware/Autostart/AppName",""
^SCFG: "Userware/Autostart/Delay","0"
^SCFG: "Userware/DebugInterface","0.0.0.0","0.0.0.0","0"
^SCFG: "Userware/Passwd"
^SCFG: "Userware/Mode","normal","","0"
^SCFG: "Userware/Stdout","ASC1"
^SCFG: "Userware/Watchdog","0"
^SCFG: "URC/CallStatus/CIEV","restricted"
^SCFG: "URC/CallStatus/SLCC","verbose"
^SCFG: "URC/Datamode/Ringline","off"
^SCFG: "URC/Ringline","local"
^SCFG: "URC/Ringline/ActiveTime","2"

OK
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