Those look like emoji, did you change the system emoji font?
KDE
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Plasma 6 Bugs
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If it hasn't, report it yourself.
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If I did it wasn't through the system settings gui, would it be in fontconfig or somewhere else?
Why do you think those are incorrect? I'm pretty sure it uses the Breeze icons when it can.
See other replies, it did not look like that initially.
Looks correct to me
Here's what it looks like on a default KDE Neon user edition live .iso, different icons.