fix: caching inaccuracy

src/to/html.rs

@@ -278,7 +278,9 @@ fn doc_to_impl<'a>(
         out.push_str(&format!("</span>{a}</div>\n"));
     }
     for section in &doc.sections {
-        if let Some(prev) = doc_args.state.cache.get(section) {
+        if doc_args.max_len.is_none()
+            && let Some(prev) = doc_args.state.cache.get(section)
+        {
             out.push_str(prev);
             continue;
         }
@@ -376,11 +378,13 @@ fn doc_to_impl<'a>(
             }
         }
         out.push_str("</div>\n");
+        if doc_args.max_len.is_none() {
             doc_args
                 .state
                 .cache
                 .insert(section, out[section_start..].to_owned());
         }
+    }
     for _ in depth..=doc.depth {
         out.push_str("</div>\n");
     }