[BUG] code block highlighting doesn't work correctly

[neotan]

Describe the bug

code blocks highlighting don't work correctly.

Expected behavior

code should be highlighted nicely.

Screenshots

https://ublogger.netlify.app/theme-documentation-built-in-shortcodes/

[salvari]

I have problems too with code highlighting, when I set the option {linesnos=false} the codeblock seems to work perfectly.
Without that option, the render shows a variable number of empty lines at the begining of every codeblock.