Patched font not behaving correctly

[shuwens]

So I ran the script and got the patched font, but it is not working correctly as expected.

fontforge -script scripts/powerline-fontpatcher NotoSansMono-Regular.ttf
Copyright (c) 2000-2018 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 17:36 UTC 13-Apr-2019-D.
 Based on source from git with hash:
The glyph named macron is mapped to U+02C9.
But its name indicates it should be mapped to U+00AF.

How can I fix it here? Thx