Affixes for date variables in `<else>` are mistakenly applied to `<if>` in the first run

[YDX-2147483647]

In the example below, we create a CSL style that

• outputs submitted without any affix if the variable exists, and
• outputs issued with prefix- & -suffix otherwise.

We test the style against the same entry twice.
This entry sets submitted to a date range, so there shouldn't be any affix.
However, the result of the first run contains prefix- & -suffix.

import CSL from "citeproc"; // v2.4.63

const sys = {
  retrieveLocale: (_lang: string) => false,
  retrieveItem(id: string) {
    return { id, submitted: { "date-parts": [[1957], [1990]] } };
  },
};
const style = `
<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0">
  <bibliography>
    <layout>
      <choose>
        <if variable="submitted">
          <text value="if: "/>
          <date variable="submitted">
            <date-part name="year"/>
          </date>
        </if>
        <else>
          <text value="else: "/>
          <date variable="issued" prefix="prefix-" suffix="-suffix">
            <date-part name="year"/>
          </date>
        </else>
      </choose>
    </layout>
  </bibliography>
</style>
`;

const citeproc = new CSL.Engine(sys, style);
citeproc.updateUncitedItems(["a", "b"]);

const [_params, body] = citeproc.makeBibliography();
console.log(body.join(""));

Actual output:

  <div class="csl-entry">if: 1957–prefix-1990-suffix</div>
  <div class="csl-entry">if: 1957–1990</div>

Expected output:

  <div class="csl-entry">if: 1957–1990</div>
  <div class="csl-entry">if: 1957–1990</div>

It looks like the state for affixes is corrupted in the first run?

Original background: zotero-chinese/styles#696

Further tests

Omitted lines are the same as the main test code above.
Only the actual outputs are given.

else with date, if, if ⇒ OK

// …
const sys = {
  // …
  retrieveItem(id: string) {
    if (id === "a") {
      return { id, issued: { "date-parts": [[1957], [1990]] } }
    }
    return { id, submitted: { "date-parts": [[1957], [1990]] } };
  },
};
// …
citeproc.updateUncitedItems(["a", "b", "c"]);
// …

  <div class="csl-entry">else: prefix-1957–prefix-1990-suffix-suffix</div>
  <div class="csl-entry">if: 1957–1990</div>
  <div class="csl-entry">if: 1957–1990</div>

else without date, if, if ⇒ The first if is wrong

// …
const sys = {
  // …
  retrieveItem(id: string) {
    if (id === "a") {
      return { id }
    }
    return { id, submitted: { "date-parts": [[1957], [1990]] } };
  },
};
// …
citeproc.updateUncitedItems(["a", "b", "c"]);
// …

  <div class="csl-entry">else: </div>
  <div class="csl-entry">if: 1957–prefix-1990-suffix</div>
  <div class="csl-entry">if: 1957–1990</div>

else without date, if without date, if with date, if with date ⇒ The second if is wrong

// …
const sys = {
  // …
  retrieveItem(id: string) {
    if (id === "a") {
      return { id, type: "article" };
    }
    if (id === "b") {
      return { id, type: "book" };
    }
    return { id, type: "book", submitted: { "date-parts": [[1957], [1990]] } };
  },
};
const style = `
<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0">
  <bibliography>
    <layout>
      <choose>
        <if type="book">
          <text value="if: "/>
          <date variable="submitted">
            <date-part name="year"/>
          </date>
        </if>
        <else>
          <text value="else: "/>
          <date variable="issued" prefix="prefix-" suffix="-suffix">
            <date-part name="year"/>
          </date>
        </else>
      </choose>
    </layout>
  </bibliography>
</style>
`;
// …
citeproc.updateUncitedItems(["a", "b", "c", "d"]);
// …

  <div class="csl-entry">else: </div>
  <div class="csl-entry">if: </div>
  <div class="csl-entry">if: 1957–prefix-1990-suffix</div>
  <div class="csl-entry">if: 1957–1990</div>