Attach (recommended) or Link to PDF file here:
[multiple.pdf](https://github.com/mozilla/pdf.js/files/6344777/multiple.pdf)

Steps to reproduce the problem:
1. Write something in a field

What is the expected behavior? (add screenshot)
The 3 fields must have the same value

What went wrong? (add screenshot)
The 2 other fields are empty

The three fields share the same name `Text3`.
It works as expected in Adobe and Chrome.
describe("issue12706.pdf", () => {
    let pages;
    beforeAll(async () => {
      pages = await loadAndWait("issue12706.pdf", "[data-annotation-id='63R']");
    });
    afterAll(async () => {
      await closePages(pages);
    });
    it("must let checkboxes with the same name behave like radio buttons", async () => {
      const selectors = [63, 70, 79].map(n => `[data-annotation-id='${n}R']`);
      await Promise.all(
        pages.map(async ([browserName, page]) => {
          for (const selector of selectors) {
            await page.click(selector);
            for (const otherSelector of selectors) {
              const checked = await page.$eval(
                `${otherSelector} > :first-child`,
                el => el.checked
              );
              expect(checked)
                .withContext(`In ${browserName}`)
                .toBe(selector === otherSelector);
            }
          }
        })
      );
    });
  });
});