How to set custom header(s) on message sent to Azure Service Bus

[Shultz, Dmitry]

Hi,

I'm following this 
https://stackoverflow.com/questions/73886170/how-to-add-custom-properties-or-label-subject-for-azure-servicebus-topic-message
 trying to set some custom headers for messages sent to Azure Service Bus, but 
when I read the same message from the service bus it has no custom headers and 
empty CamelAzureServiceBusApplicationProperties map.  Using Camel 3.14.10

Is there a bug or I'm doing/expecting something wrong?

Thanks,
Dmitry