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That's called a grandfathered interactive.
From Interactive Story from Writing.Com 101 -- which was recently updated with all the current Interactive info:
I have a free membership and have a grandfathered Interactive Story in my portfolio. If I buy (or am gifted) a Basic membership, will my item be locked when the paid membership expires?
No. That's not the intent. While it hasn't been explicitly tested, no one has reported that this has happened since the restriction was put in place in 2014.
Hope that helps.