[Tex/LaTex] Top alignment of itemize in columns of beamer

Question

I do not know what is wrong but the top alignment of the itemize environments in the two columns are different. I could not find a reason for this.

\documentclass[10pt,fleqn,t]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{kpfonts}
\begin{document}
\begin{frame}{titre}
\begin{columns}%
\begin{column}[t]{0.45\textwidth}%
text text text
\begin{itemize}
\item 1
\item 2
\end{itemize}
\end{column}
\begin{column}[t]{0.45\textwidth}%
text text text
\begin{itemize}
\item 1
\item 2
\end{itemize}
\end{column}
\end{columns}
\end{frame}
\end{document}

Answer 1

Similar behaviour was reported as Issue #78 in Beamer's development repository and also in question Beamer: Top-aligning columns within a top-aligned frame. The temporary solution proposed at former is equivalent to include some lines into your preamble

\documentclass[10pt,fleqn,t]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{kpfonts}

\makeatletter
\define@key{beamerframe}{t}[true]{% top
  \beamer@frametopskip=.2cm plus .5\paperheight\relax%
  \beamer@framebottomskip=0pt plus 1fill\relax%
  \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
  \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
% \def\beamer@initfirstlineunskip{%
%   \def\beamer@firstlineitemizeunskip{%
%     \vskip-\partopsep\vskip-\topsep\vskip-\parskip%
%     \global\let\beamer@firstlineitemizeunskip=\relax}%
%   \everypar{\global\let\beamer@firstlineitemizeunskip=\relax}}
  \def\beamer@initfirstlineunskip{}%
}
\makeatother

\begin{document}
\begin{frame}{titre}
  \begin{columns}%
    \begin{column}[t]{0.45\textwidth}%
      text text text
      \begin{itemize}
        \item 1
        \item 2
      \end{itemize}
    \end{column}
    \begin{column}[t]{0.45\textwidth}%
      text text text
      \begin{itemize}
        \item 1
        \item 2
      \end{itemize}
    \end{column}
  \end{columns}
\end{frame}
\end{document}

The result is: