HyperDX instrumentation of oRPC code

I'm using Hono + oRPC for my server API, and adding HyperDX for otel instrumentation,
I've followed the doc at https://orpc.unnoq.com/docs/integrations/opentelemetry to add an instrumentation in HyperDX "additionalInstrumentations" field in the setup, but for some reason my oRPC methods don't generate otel spans in HyperDX

any idea (or sample code) how to configure this properly?