Recent update changes for the BPMN Modeler Enterprise app (Cloud) has resolved this issue.
Diagrams produced via the BPMN Modeler Enterprise app are not preserved in the generated export on Confluence Cloud.
Steps to reproduce:
Create Page A
Add a BPMN Modeler macro to the page and define a diagram
Export Page A
Expected result: The diagram content is included in the export
Actual result: The diagram content is not included in the export