Logical replication doesn't work on databases/postgresql10-server because the file pgoutput.so is missing on /usr/local/lib/postgresql. The server returns this message when triying to make a subscription: ERROR: could not create replication slot "subtest": ERROR: could not access file "pgoutput": No such file or directory
A commit references this bug: Author: girgen Date: Wed Dec 20 22:09:09 UTC 2017 New revision: 456862 URL: https://svnweb.freebsd.org/changeset/ports/456862 Log: Fix problem with logical replication PR: 224466 Changes: head/databases/postgresql10-server/Makefile head/databases/postgresql10-server/pkg-plist-server
Fix committed. Thanks for reporting the problem!