I don't have anything large at hand that I can share. Here is a small real-world use case https://code2flow.com/wclEvF - and this is another https://code2flow.com/KdNVeJ In the latter example, please note that "Update failed: flash error" generates only one node in the flowchart.

The most complex flowcharts were created by customers and testers but I don't want to expose their data. They have hundreds of lines of code resulting in huge diagrams.