OpenTelemetry span events are not visible in APM UI

Hi @axw, I rolled back to version 8.3.2 of kibana and now i'm able to get the span events. The issue is i can only see the name of the event
for instance

span.addEvent('get data from elastic', {
event: 'Success',
message: 'Get data from elastic Success'
})

i only see

image

though that data is visible in elastic index as labels,
image

it is not visible in APM UI