This issue may occur due to compatibility changes in the update from version 11.4.0 to 12.0, where widgets or widget areas could be removed or reset. To fix this, first ensure that any theme or plugin you’re using, especially BuddyPress or similar, is updated to the latest version compatible with 12.0. After updating, try re-adding widgets manually through Appearance > Widgets or using the Customizer. You may also consider testing in a staging environment before updating to identify any potential conflicts. Source: Offical Fintechzoom.
