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Serial LTE modem strange double Ready after wakeup

nRF9160 DK NCS v1.6.0, SLM with:

CONFIG_SLM_GPIO_WAKEUP=y

CONFIG_SLM_INTERFACE_PIN=24

Sometimes after at#xsleep=0 and several pulses on pin 24 SLM wakeups with double Ready response:

AT

OK

at#xsleep=0

Ready

at#xsleep=0

Ready

Ready

AT+CFUN?

+CFUN: 0

OK

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