Custom resolution box is missing in windowed mode of standalone build in OSX

Steps to reproduce:
1) Create new project
2) File > Build Settings > Player settings > Resolution and presentation > Fullscreen mode > Windowed.
Refer screenshots.
3) Build/ Build and run
4) Observe that the custom resolution box is missing and the build is always displayed fullscreen.

Reproducible on : 2017.1, 2017.3.f3, 2018.1.b1

Works fine on : 5.6, 5.5

Regression on : 2017.1

Environment : Occurs only on Mac

Frequency : Always