Bug report: `delimiter-precedes-last="always"` not working

[zepinglee]

The last delimiter with delimiter-precedes-last="always" attribute is missing when the last name is in the literal form.

Expected:

George Lakoff, and Mark Johnson
George Lakoff, and Mark Johnson

Actual result:

George Lakoff and Mark Johnson
George Lakoff, and Mark Johnson

Full fixture:

>>===== MODE =====>>
citation
<<===== MODE =====<<


>>===== RESULT =====>>
George Lakoff, and Mark Johnson
George Lakoff, and Mark Johnson
<<===== RESULT =====<<


>>===== CSL =====>>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0">
  <info>
    <id />
    <title />
    <updated>2025-01-10T19:12:06+08:00</updated>
  </info>
  <macro name="author">
    <names variable="author">
      <name and="text" delimiter-precedes-last="always"/>
    </names>
  </macro>
  <citation>
    <layout>
      <text macro="author"/>
    </layout>
  </citation>
</style>
<<===== CSL =====<<


>>===== CITATION-ITEMS =====>>
[
    [
        {
            "id": "ITEM-1"
        }
    ],
    [
        {
            "id": "ITEM-2"
        }
    ]
]
<<===== CITATION-ITEMS =====<<


>>===== INPUT =====>>
[
    {
        "id": "ITEM-1",
        "type": "book",
        "author": [
            {
                "family": "Lakoff",
                "given": "George"
            },
            {
                "literal": "Mark Johnson"
            }
        ]
    },
    {
        "id": "ITEM-2",
        "type": "book",
        "author": [
            {
                "family": "Lakoff",
                "given": "George"
            },
            {
                "family": "Johnson",
                "given": "Mark"
            }
        ]
    }
]
<<===== INPUT =====<<


>>===== VERSION =====>>
1.0
<<===== VERSION =====<<