I am perplexed by an SSRS issue I haven't seen before. I've been a report developer for over 10 years, and work for a company that recently upgraded their reporting server from 2016 to 2019. Some of the older reports that return more than one page worth of data have the page navigation buttons disabled. But this only happens on the SECOND and subsequent times loading the report after a report server reboot.
I find I can fix the issue in individual reports by turning on caching. But this doesn't work when a report includes sub-reports. I have also tried checking the report schema to verify it is 2016, and opening and re-deploying reports from a new report project in Visual Studio.
Anyone have a hunch what could be going on with the broken page navigation?