nameref is not working for unnumbered sections due to titilesec and latexbangla

Question

I am trying to cross-reference the unnumbered chapters and sections in a book. But I found out \nameref is not working for unnumbered sections due to the packages latexbangla and \titlesec. Here is the MWE:

\documentclass[12pt, oneside]{book}
% Kalpurush font: https://www.omicronlab.com/bangla-fonts.html
\usepackage[banglamainfont=Kalpurush, banglattfont=Kalpurush]{latexbangla}

\setdefaultlanguage[numerals=Bengali,
changecounternumbering=true]{bengali}
\setcounter{secnumdepth}{5}
\setotherlanguage{english}
\usepackage{titling}
\setlength{\droptitle}{-5em}
\usepackage{titlesec}
\titleformat{\chapter}[display]
{\raggedright\normalfont\Huge\bfseries}{{\uccoff\fontfamily{lmr}\selectfont\Huge§,\uccon}\ \thechapter}{20pt}{\Huge}

\titlespacing*{\chapter}{0pt}{0pt}{40pt}
\begin{document}
\chapter{Unnumbered Chapter} \label{chap:1}
\section{Unnumbered Section} \label{sec:1}
Check \nameref{sec:2} in \nameref{chap:2}.
\chapter{Numbered Chapter} \label{chap:2}
\section{Numbered Section} \label{sec:2}
Check \nameref{sec:1} in \nameref{chap:1}. % Here, \nameref{sec:1} isn't appearing
\end{document}

And an error is showing up:

Package hyperref Warning: Suppressing empty link on input line 28.

How can I fix this problem?

Answer 1

titlesec doesn't support nameref (or nameref doesn't support titlesec). You will have to set the name for the label manually:

\documentclass[12pt, oneside]{book}
\usepackage{titlesec}
\usepackage{hyperref}
\makeatletter
\newcommand\setcurrentname[1]{\def@currentlabelname{#1}}
\makeatother
\begin{document}
\chapter{Unnumbered Chapter}\setcurrentname{Unnumbered Chapter}\label{chap:1}
\section{Unnumbered Section}\setcurrentname{Unnumbered Section}\label{sec:1}
Check \nameref{sec:2} in \nameref{chap:2}.
\chapter{Numbered Chapter} \label{chap:2}
\section{Numbered Section} \label{sec:2}
Check \nameref{sec:1} in \nameref{chap:1}. % Here, \nameref{sec:1} isn't appearing
\end{document}