Tiered Numbers Disappear Going From Mac to iPad

I have a Pages document with tiered number headings that I created on Mac and saved to iCloud.

When I open the document on iPad, all tiered numbers are "flattened" to a single level.

e.g. Pages for Mac

1. Top-Level Heading

1.1 Sub-Heading

1.2 Another Sub-Heading

2. A Second Top-Level Heading

On iPad becomes...

1. Top-Level Heading

1. Sub-Heading

2. Another Sub-Heading

2. A Second Top-Level Heading