understandingwar.org shows end notes instead of main body

Moved from: https://bugzilla.mozilla.org/show_bug.cgi?id=2051603

Environment: Operating system: Windows Firefox version: Firefox 152.0.3 (release)

Preconditions:

• Clean profile

Steps to reproduce:

1. Navigate to: https://understandingwar.org/research/russia-ukraine/russian-offensive-campaign-assessment-june-27-2026/
2. Trigger reader mode from the toolbar and observe

Expected Behavior: Reader mode renders the page correctly

Actual Behavior: Reader mode is broken

Notes:

• Reproducible on the latest Firefox Release and Nightly
• Reproducible regardless of the ETP setting
• Works as expected using Chrome

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Created from webcompat-user-report:c6b45216-30e4-4a32-9819-72e2fd0bfdd1