Fix out-by-one-level error in schema-based generation.
Fix out-by-one-level error in schema-based generation.

chunmun/tree-builder-builder,loyso/tree-builder-builder,dglazkov/tree-builder-builder,loyso/tree-builder-builder,chunmun/tree-builder-builder,loyso/tree-builder-builder,dglazkov/tree-builder-builder,chunmun/tree-builder-builder,dglazkov/tree-builder-builder