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I can't get the last unit test to pass, despite the described behavior working fine in my manual testing. Any ideas?

FAIL packages/editor/src/components/document-outline/test/index.js
  ● DocumentOutline › nested headings › should render even if the heading is nested

    expect(received).toHaveLength(expected)

    Expected length: 2
    Received length: 1
    Received object: {}

      183 | 				tableOfContentItemsSelector
      184 | 			);
    > 185 | 			expect( tableOfContentItems ).toHaveLength( 2 );
          | 			                              ^
      186 | 
      187 | 			// Unnested heading test.
      188 | 			const firstItemLevels = tableOfContentItems

      at Object.<anonymous> (packages/editor/src/components/document-outline/test/index.js:185:34)

Since we decided in #29560 that the Table of Contents block should only support other blocks when gathering headings, I think it's safe to assume similar reasoning applies here.

In other words, it's not worth the added complexity to support headings outside of the Heading block (and perhaps other core blocks).

@ZebulanStanphill is there a hook to override the content being analyzed in the outline structure? As an agency developer making client sites, we severely limit the allowed blocks and use a component-driven workflow where custom blocks all control the specific heading tags. I'm now getting asked by our clients' SEO teams why the "Outline" tab is broken in the List View.

@nikolowry Hi, I know a lot of time has passed, but can you or have you opened a new issue for the problem you described above?