[Bug]: Icon font rendering

What happened?

I'm sure this is user error, but: I've got an issue where conky fails to render some, but not all, icons in a font that supports them, specifically these: 🌧️☀️

I'm using RobotoMono, I've verified the font supports the icons in several other applications, and also the Nerd Font previewer

The text and the final icon render properly. Typically, an icon not supported by the font would be rendered by a random garbage character. I.e:

In the config I've provided, white-space is rendered.

Version

1.19.6

Which OS/distro are you seeing the problem on?

Fedora

Conky config

conky.config = {
    override_utf8_locale = true,
    font = 'RobotoMono Nerd Font Mono:size=18',
    own_window = true,
    own_window_class = 'Conky',
    own_window_type = 'desktop',
    use_xft = true,
}
conky.text = [[
🌧️☀️ ☀ Test 
]]

Stack trace

No response

Relevant log output

No response

brndnmtthws / conky