diff --git a/src/comment.rs b/src/comment.rs
index 709031dda44..c25f3be2ce6 100644
--- a/src/comment.rs
+++ b/src/comment.rs
@@ -256,7 +256,7 @@ fn identify_comment(
     config: &Config,
     is_doc_comment: bool,
 ) -> RewriteResult {
-    let style = comment_style(orig, false);
+    let style = comment_style(orig.trim_start(), false);
 
     // Computes the byte length of line taking into account a newline if the line is part of a
     // paragraph.
diff --git a/tests/source/issue-6612/hidden_code_in_doc_comment.rs b/tests/source/issue-6612/hidden_code_in_doc_comment.rs
new file mode 100644
index 00000000000..109ca4a4ca2
--- /dev/null
+++ b/tests/source/issue-6612/hidden_code_in_doc_comment.rs
@@ -0,0 +1,8 @@
+// rustfmt-format_code_in_doc_comments: true
+// rustfmt-edition: 2024
+
+/// ```
+/// println!("1"); // comment
+/// # println!("2")
+/// ```
+struct S;
diff --git a/tests/source/issue-6612/mixed_comment_types.rs b/tests/source/issue-6612/mixed_comment_types.rs
new file mode 100644
index 00000000000..c6487df51aa
--- /dev/null
+++ b/tests/source/issue-6612/mixed_comment_types.rs
@@ -0,0 +1,12 @@
+// rustfmt-edition: 2024
+
+fn wat1() {
+    println!("1"); // double slash comment
+    /* another comment type */
+}
+
+fn wat1() {
+    println!("1"); // double slash comment
+    /* another comment type */
+    //# yet another type
+}
diff --git a/tests/target/issue-6612/hidden_code_in_doc_comment.rs b/tests/target/issue-6612/hidden_code_in_doc_comment.rs
new file mode 100644
index 00000000000..109ca4a4ca2
--- /dev/null
+++ b/tests/target/issue-6612/hidden_code_in_doc_comment.rs
@@ -0,0 +1,8 @@
+// rustfmt-format_code_in_doc_comments: true
+// rustfmt-edition: 2024
+
+/// ```
+/// println!("1"); // comment
+/// # println!("2")
+/// ```
+struct S;
diff --git a/tests/target/issue-6612/mixed_comment_types.rs b/tests/target/issue-6612/mixed_comment_types.rs
new file mode 100644
index 00000000000..c6487df51aa
--- /dev/null
+++ b/tests/target/issue-6612/mixed_comment_types.rs
@@ -0,0 +1,12 @@
+// rustfmt-edition: 2024
+
+fn wat1() {
+    println!("1"); // double slash comment
+    /* another comment type */
+}
+
+fn wat1() {
+    println!("1"); // double slash comment
+    /* another comment type */
+    //# yet another type
+}