Good Morning,
Thank you for the feedback, it seems as if in more than 10 years nobody used that combination - so that's definitely a bug, probably caused by me by copy/pasting code from the digital output component.
Unlike $OUT_C there is no $ANOUT_C so I have removed that input for future releases. As you wrote, the proper way would be to use a Custom KRL component with "CONTINUE" before your analogue output in order to get the desired effect.
Best,
Johannes