Why aren't all functions displayed in the Record Heap Allocation?

[bernardmizzi]

I recorded the heap allocation so that I could take note of how much memory Javascript functions took. Using the Chrome Developer Tools I headed towards the Memory tab and selected Record allocation profile. There were several functions listed but surprisingly not all of them, and I know that all of them were called since I attached a log to all of them and they all appear in the CPU profiler where I could take note of their execution time. Surprisingly, it does not always provide the same result, sometimes functions appear and sometimes they do not.

Is there any reason why this happen or any solution to my problem?