With some documents to be (automatically) processed by Indesign Server, InDesign Server stops working - and we get the Windows message "Adobe InDesign Server 2021 has stopped working. A problem caused the program to stop working correctly. Please close the program".

As after a while our automatic system is picking up the same (possibly questionable) document again, we end up with a system where all InDesign Server instances are hanging, and no further processing happens (until a human being goes to the server and clicks the messages away).

The issue here is not that the possibly questionable document cannot be processed properly - the issue is that a server process is showing a dialog, as opposed to just aborting execution or even crashing fully (which we could then handle programmatically).

Long story short: why is InDesign Server, launched from the command line, ever showing a dialog?