Attach (recommended) or Link to PDF file here:
[occurmin0.pdf](https://github.com/mozilla/pdf.js/files/7340277/occurmin0.pdf)

Configuration:
- Web browser and its version: 95.0a1 (2021-10-13) (64-bit)
- Operating system and its version: Windows 10


Steps to reproduce the problem:
1. Open form in pdf.js

What is the expected behavior? (add screenshot)
Form is blank (subform `nomin`  does not display)
What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/7104454/137184675-d48027c0-1f17-4faa-bc97-b45814b38e36.png)

subform `nomin` displays, even though it's subform is set to `<occur max="-1" min="0" />`

const [labelNode] = labelNodes;
        if (!labelNode[$isDescendent](this.datasets)) {
          warn(`XFA - Invalid label: must be a datasets child.`);
          continue;
        }
        const valueNodes = searchNode(
          this.root,
          node,
          valueRef,
          true ,
          false 
        );
        if (!valueNodes) {
          warn(`XFA - Invalid value: ${valueRef}.`);
          continue;
        }
        const [valueNode] = valueNodes;
        if (!valueNode[$isDescendent](this.datasets)) {
          warn(`XFA - Invalid value: must be a datasets child.`);
          continue;
        }
        const label = createText(labelNode[$text]());
        const value = createText(valueNode[$text]());
        labels[$appendChild](label);
        labels.text.push(label);
        values[$appendChild](value);
        values.text.push(value);
      }
    }
  }