In device setup you can set the MQA capabilities to decoder and renderer this will stop Roon doing the MQA decode/unfold, device setup is in settings, audio then select the cog icon by the endpoint name.
In general, if the device’s MQA Capabilities are set to “Decoder and Renderer” or “Renderer” (i.e. capable of rendering), then Roon will not perform any sample rate conversion if it has also performed the MQA first decode.
The question is why your Brooklyn apparently didn’t have the correct settings. Did you change them at all?
When using a Roon Ready bridge like the microRendu, you should set the microRendu zone to “Decoder and Renderer” to achieve the behavior you are looking for.