Contradiction in Reference Manual RM0394

There is an inconsistency in RTC shadow register update frequency description. Some places in text mentions that shadow register update happens once every RTCCLK period:

34.3.5, 36.3.4: "Every RTCCLK periods, the current calendar value is copied into the shadow registers..."

34.3.10, 36.3.8: "The copy is performed every RTCCLK cycle."

And other place say that it actually happens every other RTCCLK cycle:

34.6.7, 36.6.3: "Calendar values (when reading from RTC_SSR, RTC_TR, and RTC_DR) are taken from the shadow registers, which are updated once every two RTCCLK cycles."

I assume that "every two RTCCLK cycles" is correct, because some other Reference Manuals state this consistently.