This anomaly applies to IC Rev. Engineering A, build codes QIAA-AA0.
EVENTS_HFCLKSTARTED might occur twice, and HFCLKSTAT might be wrong.
When running HFCLK with crystal.
HFCLKSTAT might be wrong when reading it after HFCLK is started.
Disregard HFCLKSTAT and EVENT_HFCLKSTARTED after first EVENT_HFCLKSTARTED.
This workaround is included in nRF5 SDK v15.0.0 and SoftDevices S140, S132, and S112 v6.0.0.