Version

3.0.2

Reproduction link

https://jsfiddle.net/9vctongd/1/

Steps to reproduce

1. open the JSFiddle provided, open the console
2. click link GO TO FOO1
3. click link GO TO BAR
4. click link GO TO FOO2

What is expected?

console prints:

foo enter

foo enter cb

foo enter

foo enter cb

What is actually happening?

console prints:

foo enter

foo enter cb

foo enter

also results in an infinite function call (function poll in base.js)