Refuse two adjacent lists on the marker spelling, not the node type

src/markdown/parse/blocks.ts

@@ -59,7 +59,7 @@ export function parseBlocks(markdown: string): ParsedBlocks {
 
 function readLine(walk: Walk, line: Line): void {
   const matched = matchContainers(walk, line)
-  // A leaf that swallows whole lines takes the marker too: no container opens inside a code or HTML block.
+  // CommonMark: no container opens inside an open code or HTML block.
   if (matched.depth === walk.stack.length && swallowsLines(walk.leaf)) {
     readBlockLine(walk, matched.rest)
     return

src/markdown/parse/markdown-to-adf.test.ts

@@ -199,6 +199,7 @@ test('measures a tab from the column the containers cut it to', () => {
 test('drops the tightness ADF does not record', () => {
   assert.deepEqual(content(markdownToAdf('- a\n\n- b\n')), [bulletList(item(paragraph('a')), item(paragraph('b')))])
   assert.deepEqual(content(markdownToAdf('- a\n\n  2. b\n')), [bulletList(item(paragraph('a'), orderedList(2, item(paragraph('b')))))])
+  assert.deepEqual(content(markdownToAdf('- a\n\n  -\n')), [bulletList(item(paragraph('a'), bulletList(item())))])
 })
 
 test('opens a list beside a paragraph only where the marker interrupts it', () => {