Hi there,
I notice that I’m able to reproduce this on iOS devices with an M1 chip, but not MacOS with an Intel chip. There are a few possible issues with WebGL on M1/M2 chips that may be manifesting here.
In particular this issue is likely the culprit. We think this is related to a bug in webkit (see discussion in 237434 – Precision issue in in Vertex Shader on iPads/M1 (but work on Intel Mac)), and have seen reports that it is fixed in Chrome Canary, meaning a fix may be officially released for Chrome soon.
What browser(s) are you seeing issues with? And are you using a machine with an M1 or M2 chip?