MATLAB can't see browser tab created by another tab?

Try opening a website that generates tabs. For example:

    [status,browser,url]=web( 'http://henke.lbl.gov/optical_constants/atten2.html','-new')

launches a x-ray attenuation length calculator. Pressing the "Submit Request" button creates a new browser tab with a plot it.

Typing:

[~,~,url]=web();

when the first tab is active returns the correct location, but "url" is empty when the second tab is active. Multiple tabs can be accessed when created separately, but tabs generated by other tabs seem to exist outside of the web() function's knowledge. Any thoughts?

This behavior exists in release 2017b (Mac and Windows version).