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Bug: Panic when using interface fragments on union fields

Bug: Panic when using interface fragments on union fields: a task in LegoFlow-SWE (Harbor dataset). When executing a GraphQL query that includes an inline fragment or named fragment spread on an interface type, where the fragment is applied to a field that returns a union type, Juniper panics with…

The task

When executing a GraphQL query that includes an inline fragment or named fragment spread on an interface type, where the fragment is applied to a field that returns a union type, Juniper panics with an error like:

Part of Lego-X/LegoFlow-SWE.