download renderdoc here https://renderdoc.org/ install and open it
if you use the macos system, it is at here https://developers.meta.com/horizon/downloads/package/renderdoc-meta-fork-for-mac-installer/
renderdoc info is like this
open your launcher by renderdoc
the example will use multimc
than you launcher will be opened, and then open the modpack
create a minal world, use preset like this
reproduce the error render problem, make sure press f1 to close hud render
press F12 and wait
send the saved file