very strange LaTeX error

["Fraga, Eric" <e.fraga@ucl.ac.uk>]

Hello all,

this may not belong in this mailing list as it's arguably a LaTeX issue
but I'm having a problem exporting a table to PDF via LaTeX.  I hope
somebody can help me out.

I've reduced my problem file to a small (hopefully minimal) example and
verified this with emacs -Q, using emacs 27.x which comes with org 9.3:

#+begin_src org
  ,* some results
  ,#+name: atable
  |------------------------------------+----------+----------------------+-----|
  | x                                  |       z1 |                   z2 |   g |
  |------------------------------------+----------+----------------------+-----|
  | [0.0005, 0.05, 0.5]                |  90000.0 |                 0.05 | 0.0 |
  | [0.000787451, 0.0575948, 0.5]      | 110000.0 |  0.05759476698672508 | 0.0 |
  |------------------------------------+----------+----------------------+-----|
#+end_src

If I export this to LaTeX, I get something that looks reasonable (elided):

#+begin_src latex
  \documentclass{scrartcl}
  \begin{document}
  % packages deleted, none of which is used anyway in the following
  \tableofcontents

  \section{some results}
  \label{sec:org4f5891c}
  \begin{table}[hbtp]
  \label{atable}
  \centering
  \begin{tabular}{lrrr}
  \hline
  x & z1 & z2 & g\\
  \hline
  [0.0005, 0.05, 0.5] & 90000.0 & 0.05 & 0.0\\
  [0.000787451, 0.0575948, 0.5] & 110000.0 & 0.05759476698672508 & 0.0\\
  \hline
  \end{tabular}
  \end{table}
  \end{document}
#+end_src

I get errors like this when compiling with pdflatex:

#+begin_example
  ! Illegal unit of measure (pt inserted).
  <to be read again> 
                     ,
  l.18 [0.000787451, 0.0575948, 0.5]
                                     & 110000.0 & 0.05759476698672508 & 0.0\\
  ! Missing = inserted for \ifdim.
  <to be read again> 
#+end_example

What am I doing wrong?  If LaTeX cannot handle [...] in a table (it has
no problem with similar text in a normal paragraph), the LaTeX exporter
should do something about this.  But I do not see why LaTeX should have
a problem in any case.  Any pointers welcome!

Note: LaTeX does not complain about the first line in the table, only
the second (and following ones in the original org file from which I
took this code snippet).

Thank you.
-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.3-34-g2eee3c