Pedro Andres Aranda Gutierrez writes on Fri  6 Jan 2023 13:10:
 > Calling with `emacs -Q` on the following MWE:
 >
 > ```
 > #+TITLE: Test
 > #+SUBTITLE: MWE for section* bug
 > #+LATEX_CLASS: article
 > # +LATEX_CLASS: scrreprt
 > #+LATEX_CLASS_OPTIONS: [english,a4paper,fontsize=11pt,oneside,headinclude]
 > # +OPTIONS: toc:nil H:4
 > # +LATEX_HEADER: \input{scrbook-extras}
 >
 > * Introduction
 >   :PROPERTIES:
 >   :UNNMBERED: t

Didn't you forget the U in UNNUMBERED?

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