Until now, when working on flows, you were not able to save a flow if there were any errors in it, and would have to fix all the errors before saving the flow, so if you made any changes and needed to save temporarily, you would be stuck.
In a recent Microsoft learn article we learn about a few new features that are coming up to flow design. These features are available only inside Solution cloud flows, and allow us to save cloud flows as draft prior to the flows being complete. Once the flows are completed, you will be able to publish the flow to make it available for users so that it can be run.
In addition to the Save as draft and publish feature, a versioning feature is added that allows you to see the version history of the flow to see how it was evolved and changed as well as restoring previous versions of the flow.
This feature is starting to roll out in the different regions, and should be available soon.