You can also do the following: Add at least one placeholder
brick in empty glyphs you want to keep, Remove empty glyphs, save,
remove any placeholder bricks
This font does not work on some systems ("… is not a valid
font") due to invalid characters ("noncharacters"). To fix this,
you can use this tool: https://fontfix.sslab1.workers.dev/
You can also do the following: Add at least one placeholder brick in empty glyphs you want to keep, Remove empty glyphs, save, remove any placeholder bricks
… more