$lookup with $search when using field as query

Wondering how a $lookup paired with $search would work. I’m expecting the following to return something, but it doesn’t. However, hard coding the query does work.

db.getCollection('recipes').aggregate([
    {
        $match: {}
    },
    {
        $unwind: "$ingredients"
    },
    {
        $lookup: {
          let: { ingredient_name: "$ingredients.name" },
          from: "products",
          as: "product",
          pipeline: [
            {
                $search: {
                    index: "products",
                    text: {
                      query: "$$ingredient_name",
                      path: {
                        wildcard: "*"
                      }
                    }
                }
            },
            {
                $limit: 1
            }
          ]
        }
    }

I am not crazy.

This was already brought up here: https://jira.mongodb.org/browse/SERVER-71036.