rsync will not recursively delete a directory on the destination file system when the -x flag is used and the source is a symlink on a different file system.
This is inconsistent with the behaviour seen when rsync'ing between directories in the same context.

Commands to reproduce:

mkdir /testing
mount -t tmpfs -o size=1M,nr_inodes=1000,mode=0700 tmpfs /testing
mkdir /testing/bar
ln -s /testing/bar /testing/foo
mkdir --parents /tmp/foo/bar/baz
rsync -arvx --delete --force /testing/foo /tmp

Result:
sending incremental file list
cannot delete non-empty directory: foo
could not make way for new symlink: foo

sent 41 bytes  received 12 bytes  106.00 bytes/sec
total size is 12  speedup is 0.23
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1060) [sender=3.0.7]