Buttons with Font Awesome icons print an error since 0.8.3

[solher]

Overview of the problem

Buefy version: [0.8.4] and [0.8.3], works fine with [0.8.2]
Vuejs version: [2.6.6]

Description

I'm getting an error [Vue warn]: Invalid prop: custom validator check failed for prop "size". in the console when using a b-button with a Font Awesome icon.

Steps to reproduce

Font Awesome dependencies:

"@fortawesome/fontawesome-svg-core": "^1.2.24",
"@fortawesome/free-brands-svg-icons": "^5.11.1",
"@fortawesome/free-solid-svg-icons": "^5.11.1",
"@fortawesome/vue-fontawesome": "^0.1.7",

Main.js:

import { library } from '@fortawesome/fontawesome-svg-core'
import { faTwitter } from '@fortawesome/free-brands-svg-icons'
import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome'

// Font Awesome
library.add(faTwitter)
Vue.component("font-awesome-icon", FontAwesomeIcon)

// Buefy
Vue.use(Buefy, {
  defaultIconComponent: "font-awesome-icon",
  defaultIconPack: "fas",
})

Template:

<b-button icon-left="twitter" icon-pack="fab" />

[jtommy]

It's only a warning but we working on it to remove it