Can't disable st2timersengine

SUMMARY

I followed the documentation(https://docs.stackstorm.com/reference/ha.html#blueprint-box) to install a highly available st2,
I can't disable st2timersengine after I add:

[timer]
enable = False

STACKSTORM VERSION

st2 3.8.0, on Python 3.6.9

OS, environment, install method

Ubuntu 18.04.6, install by apt.

Steps to reproduce the problem

add the configuration, and then restart st2:

root@prod-stackstorm-03:/etc/apt/sources.list.d# tail -n 10 /etc/st2/st2.conf
...
db_name = st2
username = stackstorm
password = XXXX
compressors = zstd

[coordination]
url = redis://:Redis_XXXXX@10.XX.XX.XXX:6379

[timer]
enable = False

root@prod-stackstorm-03:/etc/st2# st2ctl restart
Failed to stop st2chatops.service: Unit st2chatops.service not loaded.
Failed to start st2chatops.service: Unit st2chatops.service not found.
##### st2 components status #####
st2actionrunner PID: 102513
st2actionrunner PID: 102515
st2actionrunner PID: 102517
st2actionrunner PID: 102519
st2actionrunner PID: 102521
st2actionrunner PID: 102523
st2actionrunner PID: 102525
st2actionrunner PID: 102527
st2actionrunner PID: 102529
st2actionrunner PID: 102531
st2api PID: 102539
st2stream PID: 102549
st2auth PID: 102559
st2garbagecollector PID: 102562
st2notifier PID: 102565
st2rulesengine PID: 102569
st2sensorcontainer PID: 102572
st2chatops is not running.
st2timersengine PID: 102577
st2workflowengine PID: 102580
st2scheduler PID: 102583

Expected Results

I expect st2timersengine is not running.

Actual Results

Now I have duplicate rule evaluations.

Start with the HA blueprint documentation and the [timer] section in /etc/st2/st2.conf, then trace how st2ctl restart starts st2timersengine. Verify whether the enable setting is read by the service and check the reported component status. Done means st2timersengine is not running after restart and duplicate rule evaluations no longer occur.