How and when does oracle changes the object status on a view?

I have HR schema and AWARD schema. AWARD schema has views referencing the base tables in HR. Whenever I refresh HR the dependant views on AWARD becomes invalid. I recompile those views after the refresh.
Could anyone explain the internals of this object status change process? How does my AWARD schema sense the invalid status? Why it is not re-establishing the status after the data import?

I refresh HR test instance from production. If you are not so sure about this process...here is what happens ....export production HR schema, drop all the objects from HR test and import the production data into HR test.
I am not worried about what is happening but would like to understand the internal process (beyond the basics).

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How and when does oracle changes the object status on a view?

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