Drawstring ( true) not clearing the background

Thanks.
Still trying to understand why this gives unknown font on my code

Modules.addCached("Font7x11Numeric7Seg",function(){exports.add=function(a){a.prototype.setFont7x11Numeric7Seg=function(){this.setFontCustom(atob("AAAAAAAAAAAAAAEAAAAQAgBACAAAAHvQBgDAGAL3gAAAAAAAAAAHvAAA9CGEMIYQvAAAACEMIYQwhe8AB4AIAQAgBA94ADwIQwhhDCEDwAHvQhhDCGEIHgAAAgBACAEAHvAAe9CGEMIYQveAA8CEMIYQwhe8AAABjDGAAAA96EEIIQQge8AB7wIQQghBCB4AD3oAwBgDAEAAAAPAhBCCEEL3gAPehDCGEMIQAAAe9CCEEIIQAAAAAAAA"),32,atob("BwAAAAAAAAAAAAAAAAcCAAcHBwcHBwcHBwcFAAAAAAAABwcHBwcH"),11)}}}); 
// Load fonts 
require("Font7x11Numeric7Seg").add(Graphics); 
Bangle.setLCDTimeout(40); 
 
function myFunction(txt) {   
  g.reset(); 
  g.setFont("Font7x11Numeric7Seg",4);   
  g.setFontAlign(0,0);  
  g.drawString(txt, 130, 120, true); 
} 
 
g.clear(); 
 
myFunction("12:20");