screen capture in safari doesn't look right

[kfarr]

Using safari instead of chrome desktop browser andn exporting png creates visual anomaly in perspective mode

Steps to reproduce:

• using safari on mac os x go to https://app.3d.st/#https://streetmix.net/kfarr/3
• after scene loads, change camera view to perspective
• click png
• see visual artifact on trains and other objects

incorrect (png export button)

correct (screencap from 3d scene window)