Nested blocks don't work in Lexical (Payload 2.0)

Very excited about blocks in rich text. However, I quickly found something unexpected.

I'm trying to use a

block inside Lexical Rich Text field. The

block has only one

field which is also a block field (which can contain

or

blocks).

I can create a

block without problems, but I can't add blocks to its

field.

I'm tried in a minimal setup using create-payload-app, changing the RTE to Lexical, and adding the following

block:

export const transcriptBlock: Block = {
  slug: "transcriptBlock",
  labels: { singular: "Transcript", plural: "Transcripts" },
  fields: [
    {
      name: "lines",
      type: "blocks",
      required: true,
      admin: { initCollapsed: true },
      blocks: [
        {
          slug: "lineBlock",
          labels: { singular: "Line", plural: "Lines" },
          fields: [
            {
              name: "content",
              type: "richText",
              required: true,
            },
          ],
        },
        {
          slug: "cueBlock",
          labels: { singular: "Cue", plural: "Cues" },
          fields: [
            {
              name: "content",
              type: "textarea",
              required: true,
            },
          ],
        },
      ],
    },
  ],
};

I also have a collection to test the RTE called

export const Posts: CollectionConfig = {
  slug: "posts",
  admin: {
    useAsTitle: "title",
  },
  fields: [
    { name: "title", type: "text", required: true },
    { name: "content", type: "richText" },
  ],
};

I'll open a GitHub issue later today, unless someone points out a blatant mistake.