Missing numbered subsection

I use subsection{example} and on the toc shows 1.4.1 Example. But on the text only shows 1.4 Example. The numbered after chapter number 1 and section number 4 is missing. How to add the number for subsection?

Btw i have tried to see some duplicates. Tried their codes but didn’t work.

My duplicate: enter link description here

MWE :

documentclass[a4paper,12pt,oneside,openany]{book}
usepackage{pgf, tikz}
usepackage[a4paper, inner=4cm, outer=3cm, top=4cm, bottom=3cm]{geometry}
usepackage{geometry}
usepackage[onehalfspacing]{setspace}
usepackage{fancyhdr}
usepackage{titlesec}
usepackage{setspace}
usepackage[titles]{tocloft}
usepackage{tocbibind}
usepackage{indentfirst}
usepackage{blindtext}
usepackage{tocloft}
usepackage{etoolbox}
usepackage{enumitem}
usepackage{amssymb}
usepackage{amsmath}
usepackage{amsfonts}

patchcmd{section}{bfseries}{bfseriesboldmath}{}{}
setlength{cftbeforesecskip}{10pt}
setlength{cftbeforesubsecskip}{10pt}
fancyhf{}
cfoot{thepage}
linespread{1.5}
pagestyle{plain}
renewcommandcftchapdotsep{cftdotsep}
titleformat{chapter}[block]
    {normalfontbfseriescentering}
    {}{0pt}{}
titleformat{section}
    {normalfontbfseries}
    {thesection}{1em}{}
titleformat{subsection}
    {normalfontbfseries}
    {thesection}{1em}{}
titlespacing*{chapter}{0pt}{10pt}{20pt}
titlespacing*{section}{0pt}{0pt}{0pt}
titlespacing*{subsection}{0pt}{0pt}{0pt}

addtocontents{toc}{protectnullprotecthfill{Halaman}protectpar}
setlengthparindent{1.25cm} 
setcounter{secnumdepth}{2} %I TRIED THIS BUT DID'NT WORK


begin{document}


frontmatter %

pagestyle{fancy}   
renewcommand{headrulewidth}{0pt}


begin{spacing}{0.1}
    tableofcontents
%   listoffigures
%   listoftables
end{spacing}


mainmatter 
pagestyle{fancyplain}
fancyhf{}
fancyhead[R]{thepage}
renewcommand{headrulewidth}{0pt}

refstepcounter{chapter}
chapter*{textbf{BAB 1. PENDAHULUAN}}
addtocontents{toc}{setlength{cftbeforechapskip}{20pt}}
addcontentsline{toc}{chapter}{textbf{BAB 1. PENDAHULUAN}}  
thispagestyle{empty}

vspace{15pt}
section{textbf{Batasan Masalah}}  
blindtext

vspace{15pt}
section{textbf{Tujuan Penelitian}}  
blindtext  

vspace{15pt}
section{textbf{Manfaat Penelitian}}  
blindtext 

vspace{15pt}
section{textbf{Kebaruan Penelitian}}  
blindtext

subsection{Subsection 1}
blindtext
subsection{Subsection 2}
blindtext

end{document}

titleformat{subsection}
    {normalfontbfseries}
    {thesection}{1em}{}

titleformat{subsection}
    {normalfontbfseries}
    {thesubsection}{1em}{}