Merge branch '4.90-bug-fixes' into develop

Author: skoshelev

src/Libraries/Nop.Services/ScheduleTasks/ScheduleTaskRunner.cs

@@ -126,7 +126,7 @@ public virtual async Task ExecuteAsync(ScheduleTask scheduleTask, bool forceRun
                 return;
 
             //validation (so nobody else can invoke this method when he wants)
-            if (scheduleTask.LastStartUtc.HasValue && (DateTime.UtcNow - scheduleTask.LastStartUtc).Value.TotalSeconds < scheduleTask.Seconds)
+            if (scheduleTask.LastStartUtc.HasValue && Math.Round((DateTime.UtcNow - scheduleTask.LastStartUtc).Value.TotalSeconds, 0) < scheduleTask.Seconds)
                 //too early
                 return;
         }