Version: M55

What steps will reproduce the problem?
(1) Distill https://www.grc.nasa.gov/www/k-12/airplane/bga.html

What is the expected output?
Main content extracted.

What do you see instead?
"No data found"

User feedback:
https://feedback.corp.google.com/product/282/neutron?lView=rd&lReport=18197533560

Quick diagnosis:
The table containing the main content doesn't fit any of the classification rules, and the default is data table.

Possible fix:
- If the table contains <hr>, treat as layout.