pghoard version not visible in "/usr/bin/python3.6 -m pip list"

I have installed pghoard 2.2.1 version with PG13 in centos OS.
pghoard is running successfully but in the pip list the version is not shown as expected.

/usr/bin/python3.6 -m pip list
Package Version
----------------- ------------------------
backcall 0.2.0
certifi 2020.12.5
cffi 1.14.5
chardet 4.0.0
cryptography 3.3
dataclasses 0.8
decorator 4.3.0
future 0.18.2
idna 2.5
ipython 7.16.1
ipython-genutils 0.2.0
jedi 0.18.0
networkx 2.5.1
parso 0.8.2
pexpect 4.8.0
pghoard **-shell.git.describe..dev**

also in /usr/local/lib/python3.6/site-packages folder , i can see two folders created as below.
In the previous version of pghoard 2.1.0 , this was not observed

Thanks in advance.

drwxr-xr-x. 2 root root 181 Nov 10 14:16 pghoard-_shell.git.describe..dev-py3.6.egg-info
drwxr-xr-x. 4 root root 39 Nov 10 14:17 pglookout-2.0.0-py3.6.egg