With NM in initramfs ifcfg files for connections from ibft in initramfs are not created anymore and therefore creating (by anaconda) dracut arguments for target system network configuration in initramfs for storage on iSCSI does not work anymore. Anaconda needs to create these options based on NM connections.
See also bug 1749331.
https://github.com/rhinstaller/anaconda/pull/2125
FEDORA-2019-448da09d7e has been submitted as an update to Fedora 31. https://bodhi.fedoraproject.org/updates/FEDORA-2019-448da09d7e
anaconda-31.22.5-1.fc31 has been pushed to the Fedora 31 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-448da09d7e
anaconda-31.22.5-1.fc31 has been pushed to the Fedora 31 stable repository. If problems still persist, please make note of it in this bug report.