Change in behavior of defaultLanguages starting in Studio 3.57.4

[clinejj]

Describe the bug

Starting with Sanity Studio 3.57.4, there was a change in behavior to how defaultLanguages is handled within the editor.

• 3.57.3 and below: whatever language(s) is set as the defaultLanguage in the plugin configuration, could be removed when editing a document in the Studio
• 3.57.4 and above: the default language could not be removed, even if it was empty

This caused issues with our configuration, as we had a custom object that was configured as an internationalized object, which had a required field. Since we could no longer remove the object, we were unable to publish the document since the required sub-field had to be filled out.

This behavior can be reverted by removing the defaultLanguages key from the plugin configuration.

To Reproduce Using the following plugin configuration:

internationalizedArray({
  languages: [
    { id: "en-us", title: "English (United States)" },
    { id: "es-us", title: "Spanish (United States)" },
  ],
  defaultLanguages: ["en-us"],
  fieldTypes: [
    "string",
    },
  ],
}),

with a document that has a reference to internationalizedArrayString like so:

{
  title: "Test Text",
  name: "testText",
  type: "internationalizedString",
}

Steps to reproduce the behavior:

1. Go to edit the document
2. Click on the "remove" button next to the en-us text
3. See the text is unable to be removed

Expected behavior

I should be able to remove any/all properties of the internationalizedArray

Screenshots 3.57.3 - notice there is no object defined

3.57.4 - notice there is an object defined for en-us, however clicking the remove button next to the asset does nothing

Which versions of Sanity are you using?

This is done when updating to 3.57.4 or higher

What operating system are you using?

MacOS 15.1

Which versions of Node.js / npm are you running?

21.5.0

[mplingen]

We're actually encountering the exact same issue!!