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Fragment selections over nested objects are overridden instead of merged

Fragment selections over nested objects are overridden instead of merged: a task in LegoFlow-SWE (Harbor dataset). When a GraphQL query uses multiple fragments on the same concrete type and those fragments select the same nested object field, the sub‑fields from the later fragment replace the…

The task

When a GraphQL query uses multiple fragments on the same concrete type and those fragments select the same nested object field, the sub‑fields from the later fragment **replace** the sub‑fields from the earlier fragment completely, instead of being merged together.

Part of Lego-X/LegoFlow-SWE.