RE: one bug on git

Hello community 
     One problem I found recently within my working, please check my detail below. 

     I tried to run my script (check the attached file 'problem.sh') to build one git repository , it can be successful, but the command "git log -raw -1 ${revision}^ ${revision}" on that repo would generate some  unexpected result,  please check the result below

[pelou@hzling29 try_des]$ git --version git version 2.6.2

[pelou@hzling29 try_des]$ git log --raw -1 164304f48726d31336e2e130a90e42b7f1c480f8
commit 164304f48726d31336e2e130a90e42b7f1c480f8
Author: pelou <mailto:pengfei.lou@nokia-sbell.com>
Date:   Tue Dec 3 14:54:33 2019 +0800

    3

:100644 100644 9a7456b... 8148ef7... M  lpf
[pelou@hzling29 try_des]$ git log --raw -1 164304f48726d31336e2e130a90e42b7f1c480f8^ 164304f48726d31336e2e130a90e42b7f1c480f8
commit dd1a95338ffd471e5b270a487b585bbfcf9926a5
Author: pelou <mailto:pengfei.lou@nokia-sbell.com>
Date:   Tue Dec 3 14:54:33 2019 +0800

    2

:100644 100644 d474e1b... 9a7456b... M  lpf 

     Next step I changed my script(check the attached file good.sh) and only add some delays after "git push", everything is normal, check it below
[pelou@hzling29 try_des]$ git log --raw -1 2027dc54da1896cf1dfa301c3444b1690d6cb1d8
commit 2027dc54da1896cf1dfa301c3444b1690d6cb1d8
Author: pelou <mailto:pengfei.lou@nokia-sbell.com>
Date:   Tue Dec 3 15:00:45 2019 +0800

    3

:100644 100644 9a7456b... 8148ef7... M  lpf
[pelou@hzling29 try_des]$ git log --raw -1 2027dc54da1896cf1dfa301c3444b1690d6cb1d8^ 2027dc54da1896cf1dfa301c3444b1690d6cb1d8
commit 2027dc54da1896cf1dfa301c3444b1690d6cb1d8
Author: pelou <mailto:pengfei.lou@nokia-sbell.com>
Date:   Tue Dec 3 15:00:45 2019 +0800

    3

:100644 100644 9a7456b... 8148ef7... M  lpf

So please help me fix it. Please let me know if I was wrong or miss some thing

Br, Hercules