Deserialization issue with slack sdk with message attachments

Noticed this with one of our customers:

j.l.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 265032 path $.messages[115].attachments[0].list_records[0].fields[1].message See https://github.com/google/gson/blob/main/Troubleshooting.md#unexpected-json-structure at c.g.g.s.JsonReader.unexpectedTokenError(JsonReader.java:1768) at c.g.g.s.JsonReader.beginObject(JsonReader.java:469) at c.g.g.i.b.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:509) ... 43 common frames omitted Wrapped by: c.g.g.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 265032 path $.messages[115].attachments[0].list_records[0].fields[1].message See https://github.com/google/gson/blob/main/Troubleshooting.md#unexpected-json-structure at c.g.g.i.b.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:520) at c.g.g.Gson$FutureTypeAdapter.read(Gson.java:1516) at c.g.g.i.b.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:267) at c.g.g.i.b.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:558) at c.g.g.i.b.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:516) at c.g.g.i.b.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) at c.g.g.i.b.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:83) at c.g.g.i.b.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:59) at c.g.g.i.b.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:267) at c.g.g.i.b.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:558) at c.g.g.i.b.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:516) at c.g.g.i.b.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) at c.g.g.i.b.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:83)

Start with the stack trace and the JSON path $.messages[115].attachments[0].list_records[0].fields[1].message, then inspect the SDK's attachment deserialization entry point. Reproduce the customer payload and determine the expected shape for that field; done means the payload deserializes without the reported BEGIN_OBJECT/BEGIN_ARRAY error.