I posted about this before. Blokada on Android wants to use encrypted DNS and ignores DHCP DNS settings by default; and it seems like every time there’s an update, its DNS settings revert to default (or, if not exactly default, then something other than what has been working). This breaks internet access on my local network, and sometimes on other networks or mobile data, and requires me to keep messing with the DNS settings to get it working again.
I did find a solution that completely eliminates this problem, finally. In the app drawer, long-press the Blokada icon. From the menu that appears, click Uninstall. Internet will work again, allowing you to find and install DNS66. That solved the problem for me.