Any dynamic changes to the clipPath source (like animating the path) get ignored in terms of rendering/painting. Minimal demo: https://codepen.io/GreenSock/pen/XWzjqrv?editors=0010 Notice that we have to set clipPath = "none" and then set it back to "url(#clippath)" immediately on every tick of the animation in order to get Safari to render properly.
Fixed in safari technology preview ✨
Yes, this is working fine for me in STP 139 and Safari in macOS 12.3 Beta.
Yes, it does seem to be fixed in the update, thanks!
Thanks for filing the bug and verifying it!