As per home office, your visa only revoked when EU national surrender or lose the nationality as acquiring British Nationality.
It won't effect on non eu national if EU national can allow to have both nationalities on same time and if your residence card issued under EU Law at that time.
Its a great beneficial having Dual nationality, that you don't need to wait another year for BC after getting PR. You can apply straight away as soon as you get your PR card or you can make Naturalisation application straight away as soon as you complete 5 years. Make sure you need to provide strong evidence, documents bit complex but time saver.
ONLY Disadvantage, EU national will be treated as BC national for future immigration application.
Many thanks for your kind response.
Have a good day all
