while using k_sleep(K_FOREVER) for deep sleep mode, system is not waking up

Implementing deep sleep in nRF54L15

Using sys_poweroff()

System gets reset upon wake up by button press


Using k_sleep(K_FOREVER)

System is not waking up by button press


Is there any other way to implement deep sleep?
---------------------------- Or else ----------------------------------------------------------------------
Is there any wakeup concept that would help to wake up the system?

Below I have attached gatt write code using deep sleep, check & tell what's wrong in deep sleep (k_sleep(K_FOREVER) & wake up buttondeep_sleep.zip

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