--source include/master-slave.inc

--source include/have_binlog_format_mixed.inc

CREATE TABLE t1 (i INT);

CREATE OR REPLACE TRIGGER tr BEFORE INSERT ON t1 FOR EACH ROW SET @a=1;

--error ER_REFERENCED_TRG_DOES_NOT_EXIST

CREATE OR REPLACE TRIGGER tr BEFORE DELETE ON t1 FOR EACH ROW PRECEDES non_existing_trigger SET @a=2;

SHOW TRIGGERS;

--sync_slave_with_master

SHOW TRIGGERS;

Result of this test case is that master and slave go out of sync: master has no triggers, but slave still has tr.
That's because when CREATE OR REPLACE TRIGGER, it still drops the trigger, but nothing is written to the binary log.

It's possible that the underlying problem exists in earlier versions, but I couldn't reproduce it with a few other errors which can happen on trigger re-creation.