X_BOUNDARY_LOADER_IMPORT
Means
an app module imports a registration loader
Typical cause
a site/app/api/shared module imports @ultimat3/action/loader or @ultimat3/query/loader — registerAction(s)/registerQuery(ies) are the boot's, and calling one is a second registration path beside defineApi
Fix
export const api = defineApi({ actions: [yourActions], queries: [yourQueries] }); — in apps/web/api/index.ts — list the module there, then delete the loader import