Subject of the issue
The font patcher doesn't handle .ttc files correctly. It produces a weirdly-named file that seems to contain the data for the first font in the .ttc file, though Font Book.app says it doesn't pass validation.
I tried this using /System/Library/Fonts/Menlo.ttc.
FWIW here's an old unmerged PR that adds support for .ttc files to the Powerline font patcher.
Your Setup
Subject of the issue
The font patcher doesn't handle .ttc files correctly. It produces a weirdly-named file that seems to contain the data for the first font in the .ttc file, though Font Book.app says it doesn't pass validation.
I tried this using /System/Library/Fonts/Menlo.ttc.
FWIW here's an old unmerged PR that adds support for .ttc files to the Powerline font patcher.
Your Setup