If I extend a deadline during a reduced credit period, will that affect the scores of any partially completed assignments in any way?

For example, let's say I have a 10-problem assignment, 1 point per problem, that's due on the 16th for 100% credit and due on the 19th for 75% credit. If a student starts and finishes 8 problems correctly on, say, the 17th, then he'll have 6 points.

Suppose on the 18th I push the deadlines back to the 23rd for 100% credit and the 26th for 75% credit. Is the student's score updated automatically or will it remain at 6 points? Thanks.