Hi Jiri,
I use S32DS for ARM.2018.R1.
When the UART transmit data, MCU is reset.
As you mention, I add break point into reset vector handler. But Any break point does not catch.
I thinks the reason of reset is watchdog timeout by interrupt.
When the UART transmit data , MCU is often reset.
I removed watchdog function.
MCU does not reset.
Blinking LED is stop.
And A break point was caught in one of the painted parts below.
Therefore, it seems that the operation of interrupt continues to cause reset.
I don't know how to clear interrupt.

Thanks and best regards,
Byungju.