core/modules/big_pipe/src/Render/BigPipe.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/modules/big_pipe/src/Render/BigPipe.php b/core/modules/big_pipe/src/Render/BigPipe.php
index 01bc79a..95fe785 100644
--- a/core/modules/big_pipe/src/Render/BigPipe.php
+++ b/core/modules/big_pipe/src/Render/BigPipe.php
@@ -300,6 +300,7 @@ protected function sendPlaceholders(array $placeholders, array $placeholder_orde
     // Send the start signal.
     print "\n";
     print static::START_SIGNAL;
+    print "\n";
     flush();
 
     // A BigPipe response consists of a HTML response plus multiple embedded
@@ -362,7 +363,9 @@ protected function sendPlaceholders(array $placeholders, array $placeholder_orde
     }
 
     // Send the stop signal.
+    print "\n";
     print static::STOP_SIGNAL;
+    print "\n";
     flush();
   }