Locate the font file(s) in the repository that are missing the space character. Use a font editor like FontForge to add the space glyph (U+0020) to the font. Ensure the character is properly mapped and exported. Test the font in a web browser or font viewer to verify spaces display. Since this repository is archived, consider if the issue persists in the maintained fork at https://github.com/joypixels/emoji toolkit.
Font file's missing the space character · joypixels/emojione#222 | Good First Issue