Bug in HTML to lexical conversion with image reference.

Describe the Bug

When using code similar to the documentation at https://payloadcms.com/docs/rich-text/converting-html#approach-1-pre-upload-images-and-use-data-attributes-recommended , creating new richtext values programmatically to insert into the database referencing an image - The convertHTMLToLexical function incorrectly parses the HTML data-lexical-upload-id as a string, meaning the validation fails, and the item cannot be inserted.

This bug (presumably) only affects database configurations using an integer key type.

Full bug details, example, workaround and instructions in the linked repo.

Link to the code that reproduces this issue

https://github.com/stephenirven/payload-convert-html-bug-reproduce

Reproduction Steps

• Requires a database set to use an integer key type. Example uses postgres.
• Provide postgres details in .env as usual.
• Clone the repo, install as usual, run pnpm dev, create the first user as usual
• Upload an image to the media collection, which will be given id: 1
• Click the link from the dashboard to the endpoint that runs the example code.
• Instructions and details are on the dashboard.

Which area(s) are affected?

area: core

Environment Info

Binaries:
  Node: 24.11.0
  npm: 11.6.1
  Yarn: 1.22.22
  pnpm: 10.2.1
Relevant Packages:
  payload: 3.86.0
  next: 16.2.6
  @payloadcms/db-postgres: 3.86.0
  @payloadcms/drizzle: 3.86.0
  @payloadcms/graphql: 3.86.0
  @payloadcms/next/utilities: 3.86.0
  @payloadcms/richtext-lexical: 3.86.0
  @payloadcms/translations: 3.86.0
  @payloadcms/ui/shared: 3.86.0
  react: 19.2.6
  react-dom: 19.2.6
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 25.5.0: Tue Jun  9 22:26:46 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T8103
  Available memory (MB): 16384
  Available CPU cores: 8