Custom fields localeText with Relation breaks update

[drobytskyi]

Describe the bug
I want to add custom fields to Product, here is the code, which I'm adding:

vendure-config.ts

To Reproduce
Steps to reproduce the behavior:

customFields: {
    Product: [
      {
        name: "alternatives",
        list: true,
        type: "relation",
        entity: Product,
        label: [
          {
            languageCode: LanguageCode.en,
            value: "Alternative Variants",
          },
        ],
        nullable: true,
      },
      {
        name: "composition",
        type: "localeText",
        nullable: true,
        list: false
      },
      {
        name: "washing",
        type: "localeText",
        nullable: true,
        list: false
      },
      {
        name: "modelSize",
        list:false,
        nullable: true,
        type: "relation",
        entity: Asset,
        label: [
          {
            languageCode: LanguageCode.en,
            value: "Model & Size",
          },
        ],
      },
    ],
  },

Getting Error

[server] error 2/28/24, 2:35 AM - [ExceptionsHandler] Cannot set properties of undefined (setting 'alternatives')
[server] TypeError: Cannot set properties of undefined (setting 'alternatives')

Expected behavior

Updating fields in the admin UI

Environment (please complete the following information):

• @vendure/core version: 2.1.7
• Nodejs version: 20
• Database (mysql/postgres etc): postgres

Additional context
Add any other context about the problem here.

[brmk]

maybe a duplicate of #2680 ?