Google’s John Mueller announced on the Google Webmaster blog this morning that the Google Webmaster Tools team has updated the crawl errors report to show errors on the final URL of the redirect, as opposed to the origin URL of the redirect.
What this means is that Google is now showing the errors on the final destination URL instead of the redirecting URL. This should make it easier for webmasters to diagnose issues in their crawl error report, because it makes it easier for the webmaster to locate the page with the error.
In the past, Google would have reported the error observed at the end under URL A. Now, Google is reporting the error on URL B, as illustrated in the redirect graphic above.
The errors will also be visible in the total error counts for some websites.