Due to lost data from April 9 to April 25th, Google has confirmed reporting delays in Ads (formerly known as AdWords) and AdSense platforms. Plenty of publishers has received emails about upcoming changes in AdSense, many advertisers noticed and see that Google Ads reporting for April 30 and May 1 (Pacific Time) is incorrect.
Here is the current update about reporting delays in Google Ads & AdSense, “Reporting Issue – Google Ads reporting for April 30 and May 1 (Pacific Time) is incorrect. We will update this message when the issue is resolved and the data is corrected.”
I like to share the screenshot of Google Ads Reporting Delay Notice when advertisers can expand, after they login to their account.
I am also seeing tons of complaints from AdSense publishers regarding Google Ads & AdSense reporting delays. It is possibly related but there is not confirmation from Google on the AdSense reporting delay issues yet. See some of the complaints:
Google Ads Reporting Delay Notice:
I think after the release of v1.1 of Google Ads API, this is happening because publishers got notifications from Google AdSense. This is a well-known issue and probably related, but it should be sort out very soon. See forum details at Google Ads Help and Google AdSense Help.