The valor is only in the Chapter 3 completion and exploration rewards of each difficulty. The entire difficulty itself does not contain any valor rewards in the completion or exploration rewards. Hence, Chapter 1 and 2 should not be an issue at all.
So it probably is an issue if you supposedly didn't get any valor, even for chapter 3 exploration.
The Valor rewards are for mastery of Chapter 3, not for mastery of the entire Act. Regardless, me 100% exploring Chapter 3 was also 100% exploring the Master Difficulty as I explored chapter 1 & 2 first.
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So it probably is an issue if you supposedly didn't get any valor, even for chapter 3 exploration.
See this post.