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When network configuration is defined in iBFT table and ip=ibft boot option is supplied, the configuration is activated and corresponding ifcfg file is created in initramfs. In case of static ip configuration NetworkManager does not match the connection and ifcfg file created in initramfs which results in creating of another persistent connection for the ifcfg file making Anaconda stumble upon it, eg displaying the connection in GUI for editing (although iBFT connections are read-only) and generating wrong dracut boot options for target system.
Something different is actually happening here, I'll create a better report.