Save on Send (to Flash) and the SX127x module

Why does the following code work just fine on the Pixl.js when code is uploaded to RAM, but when I use "Save on Send (to Flash)", or save() it wrapped in an onInit() function, does it just print "Sending.." and then stop?

SPI1.setup({ sck:D3, miso:D4, mosi:D5 });
var sx = require("SX127x").connect({spi: SPI1, cs: D6, rst : D7 });

var config = {
  forcePaBoost: true,
};
clearInterval();
// Until DIO0 line irqs are implemented we need this:
setInterval(function() { sx.onIRQ(); }, 100);

sx.setTxConfig(config);

console.log('Sending..');
sx.send("Hello", function() {
  console.log("TX done");
});