After reopening, numbered headings like # 1. ... are parsed as an ordered list and break heading rendering

[s1m4ne]

• Searched existing issues to avoid creating duplicates.
• Confirmed that it can be reproduced in built-in themes without customized css.
• Searched http://support.typora.io/

Describe the bug

After saving and reopening a Markdown file, headings that start with numbering (e.g. # 1. Introduction) are no longer rendered as a proper heading. The 1. part seems to be parsed/treated like an ordered list marker, and the heading appearance breaks (see screenshots).
This does not happen while typing; it happens only after reopening the file in Typora.

To Reproduce

1. Create a new Markdown file in Typora.
2. Add a numbered heading, e.g.:

• # 1. Introduction
  (Possibly also affects ## 1. ..., ### 1. ..., etc.)

3. Save the file.
4. Quit Typora.
5. Reopen the saved file in Typora.

Expected behavior

The line should remain an H1 heading and render as an H1-sized title showing “1. Introduction” (without the 1. being treated as an ordered list marker).

Screenshots / Screencasts

Attached.

• Screenshot 1: actual broken rendering after reopening

• Screenshot 2: expected rendering

Sample Markdown File

Example content:

# 1. Introduction

(If needed, I can attach a minimal .md file that reproduces this.)

version

• OS: macOS 26.1
• Typora Version: 1.12.4

Additional context

• The heading renders correctly immediately after typing.
• The issue occurs only after saving + quitting + reopening the file.
• Reproduces with “No Theme” and also with my “Default” theme; I’m unsure whether that “Default” theme is built-in or a custom theme file on my machine.