The problem is that the font is not monospaced:

$ showttf MonegoNerdFontRegular.otf | grep Width
Required tables: glyf and loca have been replaced by CFF => OpenType
	advanceWidthMax=3212
	 avgWidth=1526
	 underlineWidth=141
  1229 DefaultWidthX
  1626 NominalWidthX

As counterexample

$ showttf Inconsolata\ Regular\ Nerd\ Font\ Complete\ Mono.otf | grep Width
Required tables: glyf and loca have been replaced by CFF => OpenType
	advanceWidthMax=500
	 avgWidth=500
	 underlineWidth=50
  500 DefaultWidthX
  0 NominalWidthX

The pickier applications check the Max Advance Width and compare that to the 'regular' one, and that must be of course equal on monospaced fonts.

Here you see, the 'letter' advance width is 1229, but the symbols are wider (and different from each other).

The font is (technically) proportional and not monospaced.

As for the flags, some applications look at the Panose flags, and it is not set:

In fact I know of no application that looks at the PFM stuff. Maybe you have more info on that for me?
Anyhow, it is NOT set in the font, although the commit claims it to be set:

The family naming looks good (scroll to the right).

 fontforge ~/git/nerd-fonts/bin/scripts/name_parser/query_names MonegoNerdFont* 2>/dev/null
Examining 4 font files
 |Filename                                           | | Fullname                                                          | | Family                                                  | | Subfamily                      | | Typogr. Family                           | | Typogr. Subfamily
 |-------------------------------------------------- |-| ------------------------------------------------------------      |-| ------------------------------------------------------- |-| ------------------------------ |-| ---------------------------------------- |-| ----------------------------------------
 |MonegoNerdFontBoldItalic.otf                       | | Monego Nerd Font BoldItalic                                       | | Monego Nerd Font                                        | | Bold Italic                    | | Monego Nerd Font                         | |
 |MonegoNerdFontBold.otf                             | | Monego Nerd Font Bold                                             | | Monego Nerd Font                                        | | Bold                           | | Monego Nerd Font                         | |
 |MonegoNerdFontItalic.otf                           | | Monego Nerd Font Italic                                           | | Monego Nerd Font                                        | | Italic                         | | Monego Nerd Font                         | |
 |MonegoNerdFontRegular.otf                          | | Monego Nerd Font Regular                                          | | Monego Nerd Font                                        | | Regular                        | | Monego Nerd Font                         | |

Technically you do not need a Typogr. Family if it is equal to the Subfamily, but it does not interfere with anything if you set it anyhow.

(Hope you do not mind that I try to help diagnosing font issues.)

Monego-Nerd-Font not recognized as Fixed Width #9

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