Extending Vuetify VBtn component (original question on Stack Overflow)

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Hey there.

I've asked a question about extending Vuetify's VBtn component on Stack Overflow and since realised I can also seek help here. So here I am, and here's the link to the original question - https://stackoverflow.com/questions/72144591/extending-vuetifys-vbtn-component-to-create-a-reusable-icon-button-component

I'm hoping it's something silly that I'm missing (or not doing correctly) with Vue's createElement (or even Vuetify's genContent) method.

Fingers crossed, and thanks in advance.

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A kind person called Tony19 pointed out my silly mistake, I was trying to use Material icons, when the default icons for v2.x is mdi.

If anyone is interested, my codepen's been updated so that it's now a working example.