When I create a bullet list followed by a number and then a period, it will render the number in preview correctly up to 2 digits, after and including 3 it looks like:
SYSTEM INFO:
Obsidian version: v1.9.14
Installer version: v1.9.10
Operating system: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:40 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T8132 24.6.0
Login status: logged in
Language: en
Catalyst license: none
Insider build toggle: off
Live preview: on
Base theme: adapt to system
Community theme: none
Snippets enabled: 0
Restricted mode: on
RECOMMENDATIONS:
none