This anomaly applies to IC Rev. Engineering C, build codes CKAA-CA0, QIAA-CA0.
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.