Different sides of the pitch can look to the assessor as obvious, but when speaking on the debrief it was not.If a DOGSO consideration results in a discussion, such as this one.... it wasn't DOGSO. The key word is 'Obvious'.
Or the Assessors view was blocked. Lots of possibilities to ask about.
At L3, your Assessors will tend to be in a stand with elevated view of incidents. Ground level looks different. Good assessors will talk though what they saw.
Same as careless/reckless tackles at times.