Are there any recommendations against having text in a section when it's followed by subsections but that itself isn't in a subsection? For example, compare
Case A:
CHAPTER 1: Title of chapter 1
Section 1: Title of section 1
content of section 1
Section 2: Title of section 2
content of section 2
Case B:
CHAPTER 1: Title of chapter 1
content of chapter 1 that is neither in Sec. 1 nor Sec. 2 <--- is this "proper" formatting?
Section 1: Title of section 1
content of section 1
Section 2: Title of section 2
content of section 2
As you can see, Case B, has text that isn't at the lowest possible "level". (Here, I'm user chapter-section, but the same could be said of section-subsection.)