UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Example URL:
https://www.shadertoy.com/view/4lGfWK

Steps to reproduce the problem:
see URL: 1 correct case + 2 wrong case.

test ? col1 : ( group, col2 )
where group change variables used in test or col1

What is the expected behavior?
see URL:  screen shows B W, B W, B W
meaning  test ? col1 : ( group, col2 ) evals group at the right time

What went wrong?
See URL: 
on windows/Angle, screen shows B W, B B, W W, 
meaning  test ? col1 : ( group, col2 ) evals group before test,
which cause bugs if group change variables used in test or col1

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? No
 firefox

Chrome version: 70.0.3538.110  Channel: n/a
OS Version: 
Flash Version: 

This occurs only on windows angle. Not on windows OpenGl or linux.

May somebody please set the flags
Blink>WebGL
Internals>GPU>ANGLE 
? thanks !