Value of --output-split-root (and others) ignored

Given the command sudo mkosi -f --split-artifacts --output=spam --output-split-root=eggs I expect that a file with the name "eggs" containing the root partition is created in the output directory. However the name "eggs" is ignored and the three output files are "spam", "spam.manifest" and "spam.root.raw". The last one should be named "eggs".

In load_args the arguments output_split_root, output_split_verity, output_split_verity_sig and output_split_kernel are always overwritten.

https://github.com/systemd/mkosi/blob/46c3e8b2fc97f4124e1cb3b55e33a055426380a7/mkosi/init.py#L6462-L6469