Version

2.6.11

Reproduction link

https://jsfiddle.net/t1po5sdh/

Steps to reproduce

In Firefox 75.0, I get the two radio buttons marked as invalid (i.e. surrounded by a red border) immediately on pageload. This does not happen if I either remove required or v-model

What is expected?

The radios should only be marked as invalid after form submission - as with other required input controls.

What is actually happening?

See above

I've been observing this for years already.