Refuse the pipe form where a link hides a pipe, and fall back to the directive form for every image CommonMark cannot spell

corpus/round-trip/block-nodes/container-crossing.json

@@ -34,11 +34,29 @@
                 {
                   "content": [
                     {
-                      "text": "Plain item.",
-                      "type": "text"
+                      "content": [
+                        {
+                          "attrs": {
+                            "title": "Deeper still"
+                          },
+                          "content": [
+                            {
+                              "content": [
+                                {
+                                  "text": "Two list levels down.",
+                                  "type": "text"
+                                }
+                              ],
+                              "type": "paragraph"
+                            }
+                          ],
+                          "type": "expand"
+                        }
+                      ],
+                      "type": "listItem"
                     }
                   ],
-                  "type": "paragraph"
+                  "type": "bulletList"
                 }
               ],
               "type": "listItem"
@@ -64,6 +82,23 @@
                 }
               ],
               "type": "expand"
+            },
+            {
+              "attrs": {
+                "panelType": "note"
+              },
+              "content": [
+                {
+                  "content": [
+                    {
+                      "text": "Superseded by the next run.",
+                      "type": "text"
+                    }
+                  ],
+                  "type": "paragraph"
+                }
+              ],
+              "type": "panel"
             }
           ],
           "type": "blockquote"

corpus/round-trip/block-nodes/container-crossing.md

@@ -2,9 +2,15 @@
 - :::panel warning
   Check the torque before signing off.
   :::
-- Plain item.
+- - :::expand {title="Deeper still"}
+    Two list levels down.
+    :::
 
 > :::expand {title="Full build log"}
 > The build ran for 11 minutes.
 > :::
+>
+> :::panel note
+> Superseded by the next run.
+> :::
 ::::

corpus/round-trip/block-nodes/image-boundary.json

@@ -82,6 +82,37 @@
         }
       ],
       "type": "mediaSingle"
+    },
+    {
+      "attrs": {
+        "layout": "center"
+      },
+      "content": [
+        {
+          "attrs": {
+            "alt": "",
+            "type": "external",
+            "url": "https://example.com/moon.png"
+          },
+          "type": "media"
+        }
+      ],
+      "type": "mediaSingle"
+    },
+    {
+      "attrs": {
+        "layout": "center"
+      },
+      "content": [
+        {
+          "attrs": {
+            "type": "external",
+            "url": "https://example.com/plan.png?a=1&b=2"
+          },
+          "type": "media"
+        }
+      ],
+      "type": "mediaSingle"
     }
   ],
   "type": "doc",

corpus/round-trip/block-nodes/image-boundary.md

@@ -16,3 +16,11 @@ Taken from Kiruna.
 :::mediaSingle {layout=center}
 ::media {alt="The assembly drawing" marks="[{\"attrs\":{\"href\":\"https://example.com/assembly\"},\"type\":\"link\"}]" type=external url="https://example.com/assembly.png"}
 :::
+
+:::mediaSingle {layout=center}
+::media {alt="" type=external url="https://example.com/moon.png"}
+:::
+
+:::mediaSingle {layout=center}
+::media {type=external url="https://example.com/plan.png?a=1&b=2"}
+:::