--- a/util/dbuffer.lua	Mon Aug 24 17:07:37 2020 +0200
+++ b/util/dbuffer.lua	Mon Aug 24 16:18:13 2020 +0100
@@ -123,7 +123,7 @@
 
 	self:collapse(j);
 
-	return self.items:peek():sub(i, j);
+	return self.items:peek():sub(self.front_consumed+1):sub(i, j);
 end
 
 function dbuffer_methods:byte(i, j)