Why is VSCode trying to run Java when I want to look at the source code of a `.class` file?

I want to look at some code in a .class file in VSCode (which usually works when I do ctrl+lclick on the class I want to view), but instead it brings up the terminal/console as if it's trying to execute the code for no reason.
It randomly does this, so some times it will show a class I want to see, but other times it won't show any thing, and try and run it (sometimes this bug(?) happens on the same class that it let me view earlier (I even tested with classes from java.lang, and only classes from java.lang)).

Any reason(s) why this may happen?

Thanks!
Cheers!