custom rules lost after update config

[Krysl]

Describe the bug

I have some custom rules in %AppData%\Code\User\settings.json-explorer.fileNesting.patterns
after update config by this extension, the custom rules are gone.

Reproduction

1. add some custom rule in %AppData%\Code\User\settings.json, under explorer.fileNesting.patterns
2. open Command Palette and run command File Nesting Updater: Update config now
3. you will see the custom rule gone

System Info

System:
    OS: Windows 10 10.0.19045

Used Package Manager

n/a

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

Contributions

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests (actually just go ahead and do it, thanks!)

[joshistoast]

Can confirm this happens for me too, annoying when I want to extend it.
Maybe a comment can be added to the end for the updater to ignore that line? Better yet it should only replace or update what's in the config as opposed to that whole section.