Folder created with fs.mkdirSync() has root as group owner, can't delete it via Plesk

I'm using the following Node.js code to create a folder:

The folder is created successfully, but I noticed that it has the group owner set to root. Because of this, I'm unable to delete the folder via Plesk. When I create the folder using PHP, everything works as expected. The folder can be deleted via Plesk without any issues. However, when I create the folder using Node.js, I can't delete it from Plesk.

Why is the folder created with Node.js being owned by root group? How can I make sure...

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