DA14695 AD_IRQ_SNC stuck locking rcx_mutex


I am trying to use RCX as LP clock (#define dg_configUSE_LP_CLK (LP_CLK_RCX)), and the system goes to extended_sleep and wakes up as intended, but then quickly the AD_IRQ_SNC task gets stuck in snc_mutex_SNC_lock (called via sys_rcx_calibrate_get_value).

Hardware: Custom board using DA14695 and no XTAL_32K

SDK Version: WiRa 10.440.8.6

Is that a known issue with the "current" WiRa SDK?