Unable to export full model to model import error log

Enhance the way that errors are seen within model to model import error logs. .
An example of the enhancement -  I’ve faced an issue when only first 50000 lines are exported in import error log. I have many duplicates  so most of the “errors” are not interesting to me. But since the amount of lines is limited to 50k, I cannot find the real error. 

e.g. When I try to find “Invalid parent” error in the full error log I don’t see it because there are so many duplicates.