1. Attached configuration has log-bin disabled. (default is off)
2. I couldn't reproduce it with log-bin=1 and code confirms the same.
3. I foresee issue exist with 5.7.19 (and event 5.7.18).
As per your comment it seems like you tested it with 5.7.18 with log-bin=1 and couldn't reproduce it.
"I also tested with 5.7.18-15-57-log (WSREP version 29.20) and it worked as expected (both rows are present on all members)"
"5.7.18-15-57-log" ... -log suggest log-bin=1
1. Attached configuration has log-bin disabled. (default is off)
2. I couldn't reproduce it with log-bin=1 and code confirms the same.
3. I foresee issue exist with 5.7.19 (and event 5.7.18).
As per your comment it seems like you tested it with 5.7.18 with log-bin=1 and couldn't reproduce it.
"I also tested with 5.7.18-15-57-log (WSREP version 29.20) and it worked as expected (both rows are present on all members)"
"5.7.18-15-57-log" ... -log suggest log-bin=1