Vuetify's autofocus works only on first modal open
The only thing that worked for me was the v-if="dialog" because the autofocus prop will only work on initial load which is why it was available only for the first time I opened the dialog.
So the working v-tex-field with autofocus in dialog would look something like this:
<v-text-field v-if="dialog" label="Label" autofocus></v-text-field>
In your sandbox (but also seems to be the case in your question) you had an error in your code, you removed return from the provided workaround:
watch: { dialog (val) { if (!val) return; // you removed `return` here requestAnimationFrame(() => { return this.$refs.focus.focus(); } });So actually it works