In my use case I am rendering WebGL textures with sources that derive from the local webcam user media and remote webcams through WebRTC. The simplest reproduction is at this link: https://threejs.org/examples/webgl_materials_video_webcam.html
My case is reproduced on 15inch Macbook Pro (2016) with Radeon Pro 455 GPU. I am aware of other members of my team having the same issue with different hardware.
<rdar://problem/83684934>
Thanks for the report. We're in process of shipping a fix for the regression. *** This bug has been marked as a duplicate of bug 230617 ***