It seems to destroy some of the structure.

[Nasy]

Before:


After:

Is there any way to avoid this happening?

[Yauheni Pakala]

Hi @nasyxx, thanks for the feedback.

This is a known issue in the latest version of the plugin.

I tried to fix it in dev branch, please try it, should help you:

https://github.com/wcoder/highlightjs-line-numbers.js/blob/bugfixes/multiline-nodes/src/highlightjs-line-numbers.js