Google has posted a note that the Search Analytics in the Google Search Console might be missing some image search data. Don’t worry, as this doesn’t mean you lost any traffic, but rather, it will show a drop in traffic because of a data bug.
According to Google, this impacts the Search Analytics report starting on March 24, 2017. This will only impact image search, so you might be able to see the drop if you filter the report to show only image search traffic.
Google wrote:
Some data for clicks and impressions in image search is being dropped. This is a logging issue, not a traffic issue. We are investigating and hope to have a fix soon.
As a reminder, this is only a reporting bug and shouldn’t have resulted from a real traffic loss.
Check out the image below, which shows the “note” in the chart on March 24:
Currently, there isn’t any estimated time for when this is going to be resolved.
You might have seen an image search traffic loss a few weeks ago, but this was due to a change in how Google image search works in certain countries.