Richtext <sub> doesn't work

Richtext <sub> & </sub>. Doesn’t work for whatever reason. The richtext object is invisible (i.e you can’t see the richtext in the final text).
For example, here I replaced the usual text with "Cu<sub>2</sub>", but here’s the result:
image

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This is still an issue and I cannot resolve it. I tried a custom method of replacing numbers by characters replicating their smaller size, but not all fonts support this, here’s the function for that:

image
But whatever I try, </sub> richtext does not work.