Identified the problem.

The issue is plain text is eating the line break so paragraph is failing since it expects a line break at the end.

src/parser/plain_text.rs

@@ -7,6 +7,7 @@ use super::error::Res;
 use super::object::PlainText;
 use super::Context;
 
+#[tracing::instrument(ret, level = "debug")]
 pub fn plain_text<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, PlainText<'s>> {
     if input.len() == 0 {
         return Err(nom::Err::Error(CustomError::MyError(MyError(