xmllint failed to properly `--format` certain SVG image

Refer the attached SVG image for a sample, after formatting(--huge --format) notice that:

git-cola.svg

1. At line 3, the metadata, rdf:RDF, cc:Work, dc:format, dc:type, defs, and sodipodi:nameview elements are not separated to individual lines.
2. At last line (line 8), <g>, <path />, </g>, and </svg> elements are all on the same line.

It appears that the formatting is broken to a degree, which matches the result of http://xmlbeautifier.com/ but not https://codebeautify.org/xmlvalidator, which seems to use a different algorithm.

Additional Information

xmllint --version

xmllint: using libxml version 20903
   compiled with: Threads Tree Output Push Reader Patterns Writer SAXv1 FTP HTTP DTDValid HTML Legacy C14N Catalog XPath XPointer XInclude Iconv ISO8859X Unicode Regexps Automata Expr Schemas Schematron Modules Debug Zlib Lzma

libxml

2.9.3 from Ubuntu 16.04 (pkg version: 2.9.3+dfsg1-1ubuntu0.5)