No Known Snapshots error w/pg_recvlogical and wal2json plugin...

Admins, just curious if anyone's seen this running something like the
combo in $subject, or has any insight whatsoever.

I find the error message in the src file seen later but not had time to
dig deeper yet.

Thx

pg_recvlogical: unexpected termination of replication stream: ERROR:  no known snapshots
CONTEXT:  slot "adhoc_jsievers", output plugin "wal2json", in the change callback, associated LSN A5D/12A026D8

master:postgres$ git grep 'no known snapshots'
src/backend/access/heap/tuptoaster.c:        elog(ERROR, "no known snapshots");

-- 
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800