DuckDuckGo Browser with Next DNS, possible problems?

On the Duckduckgo browser I activated the app tracking protection feature, which in the mobile enables the vpn even if it is not a real vpn, but I notice that the Duckduckgo block counter does not update remains at the blocks before I put Next DNS, is this because Next DNS already blocks at the source or maybe Next DNS does not work properly the Duckduckgo browser?

Looking forward to your kind feedback