The execution order of the promise according to the return type 2

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This question is similar to my previous "The execution order of the promise according to the return type", but it is a little different.
The execution order of the promise according to the return type
Why is the order of execution of caseA and caseB different?
The difference between the code is "return" or "return promise"
caseA: 914258367
html
head
script
var promise = Promise.resolve();

promise = promise.then(function(rtnVal) {
console.log('1');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('2');
});
promise2 = promise2.then(function(rtnVal) {
console.log('3');
});
console.log('4');
return;
});

promise = promise.then(function(rtnVal) {
console.log('5');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('6');
});
promise2 = promise2.then(function(rtnVal) {
console.log('7');
});
console.log('8');
return;
});

console.log('9');

/script
/head
/html

html
head
script
var promise = Promise.resolve();

promise = promise.then(function(rtnVal) {
console.log('1');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('2');
});
promise2 = promise2.then(function(rtnVal) {
console.log('3');
});
console.log('4');
return;
});

promise = promise.then(function(rtnVal) {
console.log('5');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('6');
});
promise2 = promise2.then(function(rtnVal) {
console.log('7');
});
console.log('8');
return;
});

console.log('9');

/script
/head
/html

caseB: 91423 - 5,6,7,8 don't even run
html
head
script
var promise = Promise.resolve();

promise = promise.then(function(rtnVal) {
console.log('1');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('2');
});
promise2 = promise2.then(function(rtnVal) {
console.log('3');
});
console.log('4');
return promise;
});

promise = promise.then(function(rtnVal) {
console.log('5');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('6');
});
promise2 = promise2.then(function(rtnVal) {
console.log('7');
});
console.log('8');
return promise;
});

console.log('9');

/script
/head
/html

html
head
script
var promise = Promise.resolve();

promise = promise.then(function(rtnVal) {
console.log('1');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('2');
});
promise2 = promise2.then(function(rtnVal) {
console.log('3');
});
console.log('4');
return promise;
});

promise = promise.then(function(rtnVal) {
console.log('5');
var promise2 = Promise.resolve();
promise2 = promise2.then(function(rtnVal) {
console.log('6');
});
promise2 = promise2.then(function(rtnVal) {
console.log('7');
});
console.log('8');
return promise;
});

console.log('9');

/script
/head
/html
Tags: javascript,function,asynchronous,promise,executionSource of the question:
https://stackoverflow.com/questions/79017026

Question and source license information:
https://meta.stackexchange.com/help/licensing
https://stackoverflow.com/

Видео The execution order of the promise according to the return type 2 канала Emrah KAYA