[Tex/LaTex] Reduce spacing after glossary title

Question

I would like to reduce the spacing after the Acronyms title to match spacing of a regular section, but don't know how.

I tried to reduce it manually using \renewcommand{\glossarypreamble}{\vspace*{-\baselineskip}}, which works, but is a really bad way of doing it.

MWE:

\documentclass[a4paper, 12pt]{article}

\usepackage[acronym]{glossaries}

\setglossarystyle{alttree}

\makeglossaries
\newacronym{frc}{FRC}{First Robotics Competition}
\newacronym{ftc}{FTC}{First Technical Challenge}
\newacronym{fll}{FLL}{First Lego League}
\glsaddall
\glsfindwidesttoplevelname

\begin{document}
  \section{Sample Text}
  \gls{frc}, \gls{ftc}, \gls{fll}

  \printglossary[type=\acronymtype]
\end{document}

Answer 1

For some reason, glossaries does \mbox{}\par at the start of a glossary, so adding an empty line.

\documentclass[a4paper, 12pt]{article}

\usepackage[acronym]{glossaries}

\setglossarystyle{alttree}
\setglossarypreamble[acronym]{\vspace*{-\baselineskip}}

\makeglossaries

\newacronym{frc}{FRC}{First Robotics Competition}
\newacronym{ftc}{FTC}{First Technical Challenge}
\newacronym{fll}{FLL}{First Lego League}

\glsaddall
\glsfindwidesttoplevelname

\begin{document}

\section{Sample Text}

\gls{frc}, \gls{ftc}, \gls{fll}

\printglossary[type=\acronymtype]

\section*{Acronyms}

\textbf{FLL} First Lego League. 1

\end{document}