The rrdcached rc script has been updated in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246122
I like the change, but now I do not have the option to provide extra flags. rrdcached_flags is still mentioned in the comments, please re-add it to command_args.
rrdcached_flags, if defined, is automatically added to the command line by the rc infrastructure, there is no need to add it explicitly to command_args.
Are you having trouble getting extra arguments passed to rrdcached? If so, verify that rrdcached_flags in /etc/rc.conf is spelled correctly, and set rc_debug="YES" in /etc/rc.conf and verify what the command line for starting rrdcaced looks like.