Checking the affected URL
Open the message and check the URL and time of measurement. Then see which instructions the website currently delivers. In the case of a template error, it is worth the counter-rehearsal with a second side of the same type.
Correct the cause where it arises: for example, in the page properties of the CMS, in the template output or in the server configuration. After the change, check again whether the desired condition is actually shipped.
Complement the Google Perspective
Technical indexability is a prerequisite, not a confirmation of indexation. With this monitoring, the suite does not query the Google index status of your URLs. For this, use the URL check and the indexing report of your Search Console.
Even after a correction, retrieval and processing by Google do not have to be carried out immediately. Therefore, do not accept a technically corrected result as a blanket statement “listed again on Google”.