Error when adding "Smart Search" Joomla module to page builder

I'm trying to add Smart Search to one of the SPPB modules we have, and I'm gettting error 500 in browser console.

Steps to reproduce:

1. Create a Smart Search Module
2. Create an SPPB module
3. Using the front-end editor, add the Joomla Module Add-on, then choose the Smart Search module you created

Expected:
Smart search module renders correctly.

Actual:

Smart search module is never rendered, and the browser console shows error 500 on the following AJAX call:

Request:

POST /index.php?option=com_sppagebuilder&view=ajax&format=json&callback=addon 500 (Internal Server Error)

Response:

{
    "error": true,
    "code": 0,
    "message": "Call to undefined method Joomla\\CMS\\Document\\JsonDocument::addHeadLink()"
}