Did you perhaps make a custom glyph selection? I have to say I'm not 100% sure if it has been fixed in the current version or only in the long overdue development version, but if you only select, say, lowercase letters, you won't get the space at all. Try generating the font again with Basic Latin to see if it works. If it does, try generating once more with the original options, but this time also add a space character to the "and also these single characters" text box.
Let me know if it works.
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