SSIS circular precedence constraints exists!

Yes, you can create circular precedence constraint chains in SSIS packages.
At least if you automate!
Using BIML (which has no check for stupidity). It does what it's told. So investigate your generated packages carefully. Probably your mysteriously failing master package arrived at this if you have the same symptoms as I had

When running from Sql Server Agent: Unexpected Termination (No messages)
When running in Visual Studio: Starting / Cancelled in output window. Hanging of Visual Studio
Windows log 
Faulting application name: devenv.exe, version: 16.2.29306.81, time stamp: 0x5d72c031
Faulting module name: DTS.dll, version: 2019.150.1301.433, time stamp: 0x5d1ee90e
Exception code: 0xc00000fd

0xc00000fd seem to indicate buffer overflow (infinite loop clue!)


Update:
This is reported by ClemJax in https://github.com/varigence/BimlPit/issues/98

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