Post Deployment Deleting Unused Data Flows Fails - Flowlets are not differentiated

The post deployment deletion of unused resources is ordered very specifically to delete "callers" before "called". Pipelines are deleted before linked services, etc. This functioned well when the call chain was very well defined between each of those layers (and within).
Unfortunately, there are now TWO kinds of "data flows" - Mapping Data Flows and Flowlets.
Either the detection mechanism in the script is not detecting flowlets that are used in data flows, or the deletion mechanism is not correctly ordering flows for deletion such that unused data flows get deleted before unused flowlets.