Finally the Perl binding fix arrived!

xs/xsp/GCode.xsp

@@ -13,7 +13,7 @@
     Ref<GCode> gcodegen();
     void process_layer(std::string gcode, size_t layer_id)
         %code{%
-            THIS->process_layer(std::move(gcode), layer_id);
+            THIS->process_layer(std::move(gcode), layer_id, true);
         %};
 
 };