The yellow icon has a too low color contrast against the white background in light mode (See the table in https://docs.google.com/spreadsheets/d/1won35PxhRFexJYE8FmZ4DCNTo7xEAxC8... or iconography.xlsx.zip → for more details).
Discussed and iterated on the issue with @mgifford, @the_g_bomb, @katannshaw, and @drupa11y
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User interface
It affects the ability of people with disabilities or special needs (such as blindness or color-blindness) to use Drupal.