Resolving Duplicate Spans in JS App Instrumentation with LangChain

Hey everyone! We're trying to instrument a JS app using a combination of langchain + openai autoinstrumentors with custom instrumentation (basically using custom instrumentation to capture all spans from langchain/openai autoinstrumentors under the same trace), and we're seeing some duplicate spans popping up from the manual instrumentation in Phoenix. It looks like the duplicate spans are duplicates of the root span only. We're using the BatchSpanProcessor but when we switch to SimpleSpanProcessor the duplicate spans go away. Does anyone know why the batch span processor duplicates some spans with some of the duplicates being orphaned(no parent id)?