Yes: Austria and Slovakia still do, possibly others as well. And Germany only stopped preventing it within the last year or two.
The UK will help circumvent this for current British citizens when they acquire new citizenship in one of those countries (eg. America famously makes you hand over your old passport, but the UK will happily ship you a replacement in an unmarked envelope), but that doesn't really work so well in the other direction.
this was true until a few years ago for Italy and France too, getting one nationality would instantly lose you the other. I think this isn't true anymore, but I do have a friend who lived in the country for decades and never picked up the nationality because of this.
roryirvine|3 days ago
The UK will help circumvent this for current British citizens when they acquire new citizenship in one of those countries (eg. America famously makes you hand over your old passport, but the UK will happily ship you a replacement in an unmarked envelope), but that doesn't really work so well in the other direction.
riffraff|3 days ago