LUA publish twice

[Nizhegorodtsev]

Hello!
Sorry for interrupting from development issues but I have found unexpected behaivor of LUA script when I try to call both: PUBLISH and DEL commands. I have subscriber which receive messages from specific channel about DEL events. I have found that sometimes it receive 2 notifications about same key.
After investigation I have found that there is some kind of correlation between DEL and PUBLISH commands.
I have implemented following scenarios:

1. Call DEL script and call PUBLISH script. Expected count of notifications - 1. Actual count - 1
2. Call PUBLISH script and call DEL script. Expected count of notifications - 1. Actual count - 1
3. Call script to perform both: DEL and PUBLISH commands. Expected count of notifications - 1. Actual count - 2
4. Call script to perform both: PUBLISH and DEL commands. Expected count of notifications - 1. Actual count - 2
   I'm using Redis Cluster with 3 masters and 3 slaves and redis-3.2.4

More information and screens with test results you can find here (https://groups.google.com/forum/#!topic/redis-db/dS6LacPPeKA)

Could you please clarify is it some kind of bug or I have to change the way how I'm using redis API

Testing scripts:
$REDIS_HOME/src/redis-cli -h xx.xx.xx.xx -p 6379 -a testpass EVAL "
local result = redis.call('DEL', KEYS[1])
redis.call('PUBLISH', ARGV[2], KEYS[1])
return result" 1 test hash REDIS.LOCK.TESTAPP

$REDIS_HOME/src/redis-cli -h xx.xx.xx.xx -p 6379 -a testpass EVAL "
redis.call('PUBLISH', ARGV[2], KEYS[1])
return redis.call('DEL', KEYS[1])" 1 test hash REDIS.LOCK.TESTAPP

$REDIS_HOME/src/redis-cli -h xx.xx.xx.xx -p 6379 -a testpass EVAL "return redis.call('DEL', KEYS[1])" 1 test hash REDIS.LOCK.TESTAPP

$REDIS_HOME/src/redis-cli -h xx.xx.xx.xx -p 6379 -a testpass EVAL "return redis.call('PUBLISH', ARGV[2], KEYS[1])" 1 test hash REDIS.LOCK.TESTAPP

Because of this issue I receive 2 notifications about LOCK removed event