Yeah, I'm having the exact same issue. I set an environment variable to CORESVG_VERBOSE and received the error:
Error: NULL ref passed to getObjectCoreSVG
It appears that using .renderingMode(.original) is causing the error for me.
So far I have been unable to fix the error, as I do want to be able to use color on my SF symbols. Is there something I'm not doing correctly, or is this something that has to do with the recent update?