title: Visual Studio 2019 SSIS package does not run when starting in IDE (only validates)
body: <p>When I run a package in Visual studio 2019, nothing appears to happen (only validation of all tasks). When I execute one task (right-click on a task, execute), it works fine.</p>
  <p><strong>Example:</strong></p>
  <p>I Created one simple task-  script task. The script task contains one line only - messagebox.show(&quot;Working.&quot;).
  When I &quot;Execute Task&quot; (right-click on task, execute), it works (a message box pops up). When I &quot;debug&quot; the package (Debug/start debugging, or F5) nothing happens. Execution results show only validation.</p>
  <p>Even two very simple basic expression tasks, ie no script tasks - if I place breakpoints on tasks (before/after execute on each) and start to debug, breakpoints don't fire. Execution results show only validation.</p>