Attach (recommended) or Link to PDF file here:
[jpa2021506744.pdf](https://github.com/mozilla/pdf.js/files/6431655/jpa2021506744.pdf)

Configuration:
- Web browser and its version: Google Chrome v89.0.4389.114 /IE ver 20H2 (OS build 19042.928)/Microsoft Edge 89.0.774.77 (64 bit)
- Operating system and its version: Windows 10 Pro 20H2 19042.928
- PDF.js version: 2.7.570
- Is a browser extension: No

Steps to reproduce the problem:
As you can see from the attached jpa2021506744 [jpa2021506744.pdf](https://github.com/mozilla/pdf.js/files/6431655/jpa2021506744.pdf)  page 15,
When using PDF.js, the  text is cut off on Japanese documents.
What went wrong? I hope to solve this problem.

I tried to improve after seeing these pages.

https://github.com/mozilla/pdf.js/issues/12110
https://github.com/mozilla/pdf.js/pull/13067

Adobe Reader does not have this problem.


What is the expected behavior? (add screenshot)
![jpa_2021_506744_OK](https://user-images.githubusercontent.com/82868736/117239725-473eda80-ae6a-11eb-8de6-1f96250b8351.jpg)

What went wrong? (add screenshot)
![jpa_2021_506744_NG](https://user-images.githubusercontent.com/82868736/117239739-4dcd5200-ae6a-11eb-8db9-61b33088574c.jpg)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

dffBuf[j] = dffEntry.name;
              } ele f (Num(dffEntry) || Ref(dffEntry)) {
                dffBuf[j] = dffEntry.tStrng();
              }
            }
            hah.update(dffBuf.jn());
          }
        }
      }
      cnt frtChar = dct.get("FrtChar") || 0;
      cnt latChar = dct.get("LatChar") || (cte ? 0xffff : 0xff);
      hah.update(`${frtChar}-${latChar}`);
      cnt tUncde = dct.get("TUncde") || baeDct.get("TUncde");
      f (Stream(tUncde)) {
        cnt tream = tUncde.tr || tUncde;
        unt8array = tream.buffer
          ? new Unt8Array(tream.buffer.buffer, 0, tream.bufferLength)
          : new Unt8Array(
              tream.byte.buffer,
              tream.tart,
              tream.end - tream.tart
            );
        hah.update(unt8array);
      } ele f (Name(tUncde)) {
        hah.update(tUncde.name);
      }
      cnt wdth = dct.get("Wdth") || baeDct.get("Wdth");
      f (wdth) {
        unt8array = new Unt8Array(new Unt32Array(wdth).buffer);
        hah.update(unt8array);