Decoupling is deactivated by default now

src/Worker/Cron.php

@@ -93,7 +93,9 @@ class Cron
 			Queue::clear();
 
 			// Process all unprocessed entries
-			Queue::processAll();
+			if (DI::config()->get('system', 'decoupled_receiver')) {
+				Queue::processAll();
+			}
 
 			// Search for new contacts in the directory
 			if (DI::config()->get('system', 'synchronize_directory')) {

static/defaults.config.php

@@ -166,7 +166,7 @@ return [
 
 		// decoupled_receiver (Boolean)
 		// Decouple incoming AP posts by doing the processing in the background.
-		'decoupled_receiver' => true,
+		'decoupled_receiver' => false,
 
 		// distributed_cache_driver (database|memcache|memcached|redis)
 		// Whether to use database, Memcache, Memcached or Redis as a distributed cache.