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NRF52840 ble_App_uart_c example hangs in first start and debug mode (SDK 17.1.0)

I am using ble_app_uart_c example to scan nrf beacons. Facing strange issue with debugger.

Enabled RTT and disable UART Logs, when i connect debugger and put break point after ble_stack_init() call then debugger get struck at SVCALL(SD_SOFTDEVICE_ENABLE, uint32_t, sd_softdevice_enable(nrf_clock_lf_cfg_t const * p_clock_lf_cfg, nrf_fault_handler_t fault_handler));

But if disconnect debugger and do hard reset things are fine. 

What could be the reason behind this issue?

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