Symptoms
Assume that you use the Report Viewer Web Part on a Microsoft SQL Server 2016 Reporting Services (SSRS 2016) report server that's configured to run in SharePoint integrated mode. In this situation, the Adjust height to fit zone setting of the Report Viewer Web Part isn't respected. For example, when you open the SharePoint webpage that contains the Report Viewer Web Part, only part of the report is showed up inside the Report Viewer Web Part. Then, if you refresh the webpage, more report content is displayed.
Resolution
This issue is fixed in the following cumulative updates for SQL Server:
Cumulative Update 5 for SQL Server 2016 RTM
Cumulative Update 3 for SQL Server 2016 SP1
About the cumulative updates for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Latest cumulative update for SQL Server 2016
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.