Index: src/Plugin/views/pager/CalendarPager.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/Plugin/views/pager/CalendarPager.php	(revision 1ef5b86b11bf69641cc6539bcc93f73e7afb8ebf)
+++ src/Plugin/views/pager/CalendarPager.php	(date 1540889478000)
@@ -104,7 +104,14 @@
       $current_position++;
     }
 
-    return $this->view->getUrl($arg_vals, $this->view->current_display);
+    $base_path = $this->view->getPath();
+    $query = $input;
+
+    if ($this->view->ajaxEnabled()) {
+      // Ajax pager (in view block) does not work properly without this.
+      $query['view_args'] = implode('/', $arg_vals);
+    }
+    return Url::fromUri('internal:/' . $base_path . '/' . implode('/', $arg_vals), ['query' => $query]);
   }
 
   /**