Follow up from https://github.com/facebook/react/pull/11616.

Here's one I found. These two invariants:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L330-L343

are in a function that's behind a DEV block:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L447-L449

I don't think this is intentional, but need to verify.

There may be more. I'll use this issue to track while https://github.com/facebook/react/pull/11616 preserves existing behavior.
'a component returning text node between two text nodes',
        async render => {
          const B = () => 'b';
          const e = await render(
            <div>
              {'a'}
              <B />
              {'c'}
            </div>,
          );
          if (
            render === serverRender ||
            render === clientRenderOnServerString ||
            render === streamRender
          ) {
            
            expect(e.childNodes.length).toBe(5);
            expectTextNode(e.childNodes[0], 'a');
            expectTextNode(e.childNodes[2], 'b');
            expectTextNode(e.childNodes[4], 'c');
          } else {
            expect(e.childNodes.length).toBe(3);
            expectTextNode(e.childNodes[0], 'a');
            expectTextNode(e.childNodes[1], 'b');
            expectTextNode(e.childNodes[2], 'c');
          }
        },
      );
      itRenders('a tree with sibling host and text nodes', async render => {
        class X extends React.Component {