Editor leaks memory, reports wrong working set.

Hi!
Since 5.5, I've encountered this problem several times, but I wasn't able to pinpoint the source of the leak yet. But the problem is that application is not reporting entire working set. Allocated memory size trigger Resource Exhaustion Diagnosis Event (the low memory warning window), yet the task manager reports but a fraction of the memory allocated. This happens on Windows 10. Below is the screenshot of Event Viewer reporting over 20GB of Unity working set, and Task Manager reporting only 2.4GB.

Edit: I'm, currently using 5.6.0b3, but I can confirm that 5.5 is reporting memory the same way.

 

Having this too sometimes, not always.