Attach (recommended) or Link to PDF file here:
[arcs.pdf](https://github.com/mozilla/pdf.js/files/7610486/arcs.pdf)

Configuration:
- Web browser and its version: 96.0a1 (2021-11-26) (64-bit)
- Operating system and its version: Windows 10
- PDF.js version:
- Is a browser extension:

Steps to reproduce the problem:
1. Open PDF

What is the expected behavior? (add screenshot)
Arcs are drawn correctly, and can render on top of each other
![image](https://user-images.githubusercontent.com/7104454/143624981-1a45c37a-bc30-4b64-893a-684da9cdfe3b.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/7104454/143624965-5506df08-3510-4e60-908f-d64499050660.png)

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

const parent = this[$getSubformParent]();
    if (!parent[$isSplittable]()) {
      return false;
    }
    if (this[$extra]._isSplittable !== undefined) {
      return this[$extra]._isSplittable;
    }
    if (this.layout === "position" || this.layout.includes("row")) {
      this[$extra]._isSplittable = false;
      return false;
    }
    if (
      parent.layout &&
      parent.layout.endsWith("-tb") &&
      parent[$extra].numberInLine !== 0
    ) {
      
      return false;
    }
    this[$extra]._isSplittable = true;
    return true;
  }
  [$flushHTML]() {