reset() and save() question

Maybe it's the WebIDE?
Chrome Version 54.0.2840.98 (64-bit) on OSX 10.11.6 here with WebIDE.

I played around with Settings->Communications->Save on Send.
When it is set to "Yes, even execute after 'reset()'" I can remove the code when:

• putting on dummy line like var foo; on the right hand pane
  
• click "Send to Espruino"
  
  

Simple example:

>dump();
function onInit() {digitalPulse(LED1, 1, 100);}
pinMode(D29, "input_pulldown", true);
=undefined

Not working:

>reset();save();
=undefined
Running onInit()...
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v88 Copyright 2016 G.Williams
Erasing Flash.....
Writing....
Compressed 32000 bytes to 1222
Checking...
Done!
Running onInit()...
>dump();
function onInit() {digitalPulse(LED1, 1, 100);}
pinMode(D29, "input_pulldown", true);
=undefined

Putting this into the right hand pane finally kills the code (actually it replaces the current code by some dummy code):

var foo;

Send and check:

>Erasing Flash.....
Writing...
Compressed 32000 bytes to 17
Checking...
Done!
Loading 17 bytes from flash...
=undefined
>dump();
var foo = undefined;
pinMode(D29, "input_pulldown", true);
=undefined

This is strange...