Hi!
b-form-radio-group does not show checked item in group when button mode and group in disabled state.
b-form-radio-group without button mode shows checked item in disabled state.

I think in both modes in disabled state checked item should be shown. Isn't it?

<b-form-radio-group
id="btn-radios-2"
v-model="selected"
:options="options"
:aria-describedby="ariaDescribedby"
button-variant="outline-primary"
size="lg"
name="radio-btn-outline"
buttons
disabled
>

https://bootstrap-vue.org/docs/components/form-radio#button-style-radios