Bogus 'flat' has been replaced with 'variant="flat"' for VBtn

[Glandos]

I'm using vuetify.configs['flat/recommended-v4'], and the following template reports an error:

                        <v-btn
                          size="small"
                          flat
                          density="comfortable"
                          :icon="mdiContentCopy"
                          @click="copyContentToClipboard"
                        />

However, documentation mentions:

flat

boolean	

false

Removes the button box shadow. This is different than using the ‘flat’ variant.

So, to me, this should be excluded from rule here. Or documentation should be updated?