Postgres logical replication breakage

docker-compose.yml

version: "3"

services:
  master:
    image: postgres:11
    environment:
      POSTGRES_PASSWORD: abc123
    command: -c config_file=/etc/postgresql/postgresql.conf
    volumes:
      - ./postgresql.conf:/etc/postgresql/postgresql.conf
    ports:
      - 5432:5432
  replica:
    image: postgres:11
    environment:
      POSTGRES_PASSWORD: abc123
    command: -c config_file=/etc/postgresql/postgresql.conf
    volumes:
      - ./postgresql.conf:/etc/postgresql/postgresql.conf
    ports:
      - 15432:5432

master-broken.sql

SELECT pg_create_logical_replication_slot('my_slot', 'pgoutput');

CREATE ROLE repuser WITH LOGIN REPLICATION PASSWORD 'abc123';

CREATE TABLE widgets (
    id SERIAL,
    name TEXT,
    price DECIMAL,
    CONSTRAINT widgets_pkey PRIMARY KEY (id)
);

GRANT ALL PRIVILEGES ON TABLE widgets TO repuser;

INSERT INTO widgets (name, price) VALUES ('Hammer', 4.50), ('Coffee Mug', 6.20), ('Cupholder', 3.80);

CREATE PUBLICATION widgets_pub;
ALTER PUBLICATION widgets_pub ADD TABLE ONLY widgets;

master-works.sql

CREATE ROLE repuser WITH LOGIN REPLICATION PASSWORD 'abc123';

CREATE TABLE widgets (
    id SERIAL,
    name TEXT,
    price DECIMAL,
    CONSTRAINT widgets_pkey PRIMARY KEY (id)
);

GRANT ALL PRIVILEGES ON TABLE widgets TO repuser;

INSERT INTO widgets (name, price) VALUES ('Hammer', 4.50), ('Coffee Mug', 6.20), ('Cupholder', 3.80);

CREATE PUBLICATION widgets_pub;
ALTER PUBLICATION widgets_pub ADD TABLE ONLY widgets;

SELECT pg_create_logical_replication_slot('my_slot', 'pgoutput');

postgresql.conf

wal_level = logical
listen_addresses = '*'
log_min_messages = debug1
log_min_error_statement = debug1

replica.sql

CREATE TABLE widgets (
    id SERIAL,
    name TEXT,
    price DECIMAL,
    CONSTRAINT widgets_pkey PRIMARY KEY (id)
);

CREATE SUBSCRIPTION widgets_sub
       CONNECTION 'dbname=testdb host=master port=5432 user=repuser password=abc123'
       PUBLICATION widgets_pub
       WITH (slot_name='my_slot', create_slot=false);

run.sh

#!/usr/bin/env bash

docker-compose up -d

export PGHOST=127.0.0.1
export PGPORT=5432
export PGUSER=postgres
export PGPASSWORD=abc123

echo -n "Waiting for database to be available"
until psql postgres -c 'SELECT 1;' &>/dev/null; do
  echo -n "."
  sleep 1
done; echo

echo "Load sql on master"
createdb testdb
psql testdb < $1

sleep 2

export PGPORT=15432
echo "Creating database on replica"
createdb testdb
echo "Load sql on replica"
psql testdb < replica.sql

docker-compose logs -f replica

docker-compose down

./run.sh master-broken.sql shows that logical replication breaks if replication slot is created first.
./run.sh master-works.sql shows that logical replication works if replication slot is created last (or at least after data is inserted).