How do I avoid `sectsty` removing a line break when using `paragraph` as a subsubsubsection

Question

I am trying to use the first bit of code in this answer to use paragraph like a subsubsubsection.

The problem is that there is a conflict with sectsty - without this the output is exactly as in @GonzaloMedina's answer. When I add sectsty the line break between the paragraph title and the following text disappears, as in the image below. How can I reinsert the line break?

\documentclass{article}

%Sectioning and headings
%------------------------

\usepackage{titlesec}

\usepackage{sectsty}          % put section headings in sans-serif font
\setcounter{secnumdepth}{4}

\titleformat{\paragraph}{\normalfont\normalsize\bfseries}{\theparagraph}{1em}{}
\titlespacing*{\paragraph}{0pt}{3.25ex plus 1ex minus .2ex}{1.5ex plus .2ex}

\begin{document}

some text
\section{Section}
some text
\subsection{Subsection}
some text
\subsubsection{Subsubsection}
some text
\paragraph{Paragraph}
some text

\end{document}

Answer 1

With titlesec being the package with the more complicated macros (thus more fail safe switches to determine whether or not a package is loaded), as a rule of thumb I always load these packages at the latest.

The following produces the correct indentation and a line break:

\documentclass{article}

%Sectioning and headings
%------------------------

\usepackage{sectsty}          % put section headings in sans-serif font
\setcounter{secnumdepth}{4}

\usepackage{titlesec}

\titleformat{\paragraph}{\normalfont\normalsize\bfseries}{\theparagraph}{1em}{}
\titlespacing*{\paragraph}{0pt}{3.25ex plus 1ex minus .2ex}{1.5ex plus .2ex}

\begin{document}

some text
\section{Section}
some text
\subsection{Subsection}
some text
\subsubsection{Subsubsection}
some text
\paragraph{Paragraph}
some text
%

\end{document}