Meta Box lost ability to update Custom Table Group fields via API after 1.30.5

Meta Box will not save a Custom Table Group field when using a POST API call to posts/post_ID.

The payload will look correct on the output response, but if you GET the same post immediately after, the Group field is unchanged.

For example, I have a Group called Highlights Group with fields called Highlights within. This Custom Field is stored in a Custom Table.

I've previously been updating it successfully like this:

{
    "meta_box": {
        "HighlightsGroup": [
            {
                "highlight": "This is a test"
            }
        ]
    }
}

I have tested this up to the current version 2.0.2. The most recent version where this ability still works is 1.30.5 and I remain using that version due to this issue.