[Errata] Pin PC13 is not released when RTC_OUT is remapped to PB2

Some time ago I had this issue in a project with STM32L433CCU6:

// Calibration clock output
#if 0
	// Warning! PC13 is switched to output mode even with OSEL = 00b
	RTC->OR = RTC_OR_OUT_RMP; // Remap RTC_CALIB from PC13 to PB2
	RTC->CR |= RTC_CR_COE | RTC_CR_COSEL; // Enable 1 Hz
#endif

The code used the following configuration from RTC_OR register description, but the PC13 pin was still switched to output mode:

RTC_OUT_RMP = ‘1’:

If OSEL = ‘00’ and COE = ‘1’: RTC_CALIB is output on PB2

If I'm not mistaken, this issue is present at least on all L43x devices. The current errata versions have two issues related to pin PC13, but not this one.