This anomaly applies to Revision 3, build codes QFAA-Exx, QCAA-Exx, CAAA-Exx.
Using the mode where watchdog is paused in CPU Idle, the current consumption jumps from 3 µA to 400 µA.
NRF_WDT->CONFIG = (WDT_CONFIG_SLEEP_Pause<<WDT_CONFIG_SLEEP_Pos);
Reduced battery life.
Do not enter System ON IDLE within 125 µs after reloading the watchdog.