Salt execution module junos.install_config with mode=dynamic comment is not working

[chidanandpujar]

Description of Issue/Question

Salt execution module junos.install_config with mode=dynamic , comment is not working

Setup

(Please provide relevant configs and/or SLS files (Be sure to remove sensitive info).)

Steps to Reproduce Issue

(Include debug logs if possible and relevant.)
salt "vmx1" junos.install_config salt://config_dynamic.set mode=dynamic comment="commit dynamic mode" format=set --out=yaml
ret = msgpack.loads(msg, use_list=True, ext_hook=ext_type_decoder, encoding=encoding)

vmx1:
message: Successfully loaded and committed!
out: true

show system commit
0 2019-05-02 03:29:14 PDT by root via cli
1 2019-05-02 03:23:07 PDT by root via cli
2 2019-05-02 03:22:01 PDT by root via cli
3 2019-04-26 04:55:07 PDT by root via other
4 2019-04-26 04:44:28 PDT by root via cli commit confirmed, rollback in 10mins
5 2019-04-26 03:03:37 PDT by regress via cli
6 2019-04-26 02:34:08 PDT by root via cli commit synchronize
7 2019-04-26 02:17:13 PDT by root via cli commit synchronize
8 2019-04-26 02:17:00 PDT by root via cli
9 2019-04-26 02:15:46 PDT by root via button
10 2019-04-26 02:15:21 PDT by root via other

Versions Report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

root@olympics-salt:/srv/salt# salt --versions-report
Salt Version:
Salt: 2019.2.0

Dependency Versions:
cffi: 1.12.2
cherrypy: Not Installed
dateutil: Not Installed
docker-py: Not Installed
gitdb: Not Installed
gitpython: Not Installed
ioflo: Not Installed
Jinja2: 2.10.1
libgit2: Not Installed
libnacl: Not Installed
M2Crypto: Not Installed
Mako: Not Installed
msgpack-pure: Not Installed
msgpack-python: 0.6.1
mysql-python: Not Installed
pycparser: 2.19
pycrypto: 2.6.1
pycryptodome: Not Installed
pygit2: Not Installed
Python: 2.7.9 (default, Apr 17 2019, 20:16:39)
python-gnupg: Not Installed
PyYAML: 5.1
PyZMQ: 18.0.1
RAET: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 5.1.1
ZMQ: 4.3.1

System Versions:
dist: debian jessie/sid
locale: UTF-8
machine: x86_64
release: 4.2.0-27-generic
system: Linux
version: debian jessie/sid