MF/MN's SVGO rules contain
- collapseGroups: false - mergePaths: false
which seem to have been introduced in I7b09e89a5a72ff241c38914044b931520311efee and since them never been revisited on possible rendering issues.
The conventions in https://www.mediawiki.org/wiki/Manual:Coding_conventions/SVG#Exemplified_safe_configuration provided widely proofed harmless optimizations.
- Visit https://en.m.wikipedia.org/wiki/Front_end in older Grade A browsers like IE 11 and look out for icons being visually correct, not having rendering issues. Both as logged-in and logged-out user as some icons are login-state specific.