(This is an older article that I hadn’t published back then because it might not be fully accurate, i.e. the steps may not be applicable. Yet, it contains some valuable information so I decided to publish it now. Read with a grain of salt. If you have corrections, don’t hesitate to comment or email me.)
TL;DR
If Disk Utility fails to clone an APFS container, giving "APFS inverter failed" as
Source: Thomas Tempelmann