If you encounter a warning saying images cannot be crawled because of robots.txt restrictions or it says you have to wait 3 days than this article will explain the issue in more detail.
First lets understand the diagnostics tab, when you see errors and warnings in the diagnostics tab and you have fixed all issues. It can take up to 30 days for the issues to clear up. This is because Google’s Bot for Google Shopping does not crawl every page every day. You will notice that after 2 days your issue count will drop lower and lower. So do not panic that you don’t see it drop within the next day, wait at least 2 days and check the original error count vs the new one. If it’s dropping down you have done a good job.
When you receive a message related to the robots.txt, it does not mean it is related to this file. It can also mean that you have an error in the image url or the size of the image is too large. Which might cause your server not to respond quickly enough.
This warning can be triggered by a single or multiple issues.
Lets create a simple checklist for you to confirm that all settings on your website meet Google’s requirements.
If you have checked everything and there are no issues wait for a couple of re-crawls and Google will automatically resolve the issue.
You can force a re crawl quicker by changing the filename or appending a random query string.