Why Movie Render Queue Object ID with "Full" Id Type has no material ids in the exr file

Development Cinematics & Media Virtual Production
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After I read the code of MRQ, in my opinion the “full’ id is just the details info of an object. The line
“StringBuilder.Appendf(TEXT(”%s.%s[%d.%d]”), *InActor->GetActorLabel(), *GetNameSafe(InPrimComponent), InMaterialIndex, InSectionIndex);"
gives only the material index(just a number), and an actor can be separated as several components. The "full’ id is not a combination of actor id and material id.