How to force adding dotted line on chapter without ruin the chapter fontsize

i found related problems to this, See duplicate.
but, when i tried to use this codes, this ruined my chapter fontsize like this:
see picture

i have setting the fontsize of the chapter using titleformat. So, i’ve changed the chapter fontsize to 12pt. And after using code from duplicate link, my fontsize was ruin and getting bigger.

This is my codes:

documentclass[a4paper,12pt,oneside,openany]{book}
usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
usepackage[onehalfspacing]{setspace}
usepackage{fancyhdr}
usepackage{titlesec}
usepackage{setspace}
usepackage{tocloft}
fancyhf{}
cfoot{thepage}
linespread{1.5}
pagestyle{plain}
renewcommandcftchapdotsep{cftdotsep}  %MY ATTEMPT HERE
titleformat{chapter}[display]
    {bfseriescentering}
    {chaptertitlename thechapter}{12pt}{}
titlespacing*{chapter}{0pt}{10pt}{10pt}

renewcommand{contentsname}{DAFTAR ISI}
renewcommand{listtablename}{DAFTAR TABEL}
renewcommand{listfigurename}{DAFTAR GAMBAR}


begin{document}
clearpage
thispagestyle{empty}

frontmatter %

pagestyle{fancy}   
renewcommand{headrulewidth}{0pt}
include{cover1}
include{cover2}
linespread{1}
tableofcontents %TABLE OF CONTENTS
listoffigures
listoftables
mainmatter %

end{document}

Btw, i’m using cmd: chapter*{...} and addcontentsline{toc}{chapter}. To create chapter title. Not shown on my code cz it includes on another file. I split my main file into some parts.

% chapterdotsprob.tex SE 555536

documentclass[a4paper,12pt,oneside,openany]{book}
usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
usepackage[onehalfspacing]{setspace}
usepackage{fancyhdr}
usepackage{titlesec}
usepackage{setspace}
usepackage[titles]{tocloft}
fancyhf{}
cfoot{thepage}
linespread{1.5}
pagestyle{plain}
renewcommandcftchapdotsep{cftdotsep}  %MY ATTEMPT HERE
titleformat{chapter}[display]
    {bfseriescentering}
    {chaptertitlename thechapter}{12pt}{}
titlespacing*{chapter}{0pt}{10pt}{10pt}
%renewcommandcftchapdotsep{cftdotsep}  %MY ATTEMPT HERE

renewcommand{contentsname}{DAFTAR ISI}
renewcommand{listtablename}{DAFTAR TABEL}
renewcommand{listfigurename}{DAFTAR GAMBAR}


begin{document}
clearpage
thispagestyle{empty}

frontmatter %

pagestyle{fancy}   
renewcommand{headrulewidth}{0pt}
include{cover1}
include{cover2}
linespread{1}
tableofcontents %TABLE OF CONTENTS
listoffigures
listoftables
mainmatter %

chapter{One}
Some text
chapter{Two}
More text.

end{document}