clearTimeout with invalid handle cause program runs longer

Version: Tested on 6.0.0
Platform: Tested on Windows & MacOS
Subsystem: Timer

This program cost 20 seconds, but 10.5 seconds was expected:

var handle = setTimeout(function(){
    clearTimeout(handle);
    handle = setTimeout( function() {
    }, 10000 );
    setTimeout( function() {
        clearTimeout( handle );
    }, 500 );
}, 10000);

But all below codes work as expected:

var handle = setTimeout(function(){
    clearTimeout(handle);
    handle = setTimeout( function() {
    }, 10000 );
    setTimeout( function() {
        clearTimeout( handle );
    }, 500 );
}, 2000);  // <-- different delay

var handle = setTimeout(function(){
        //clearTimeout(handle);  <-- comment this line.
    handle = setTimeout( function() {
    }, 10000 );
    setTimeout( function() {
        clearTimeout( handle );
    }, 500 );
}, 10000);

Does clearTimeout with a invalid handle causes this problem?