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- Add validation for invalid fixedCollection structures in Switch, If, and Filter nodes - Detect and prevent nested 'conditions.values' patterns that cause n8n UI crashes - Support both 'n8n-nodes-base.x' and 'nodes-base.x' node type formats - Provide auto-fix suggestions for invalid structures - Add comprehensive test coverage for all edge cases This prevents AI agents from creating invalid node configurations that break n8n's UI.