How to make a Fabric EventStream customapp EventHub not strip the braces from the payload

Question

I'm running into problems in downstream processing due to the Fabric EventStream source customapp EventHub stripping the braces from the payload. If I use an Azure EventHub as the source, this is not a problem. Does anyone know how to make the Fabric EventStream customapp EventHub not strip the braces from the payload?

Example:

Azure EventHub	customapp EventHub
[{...}]	{...}