Unity 2019.2.14 - problem with visual studio

I have seen the following in the scripts:

5229425--521525--upload_2019-11-30_1-13-12.png

‘MonoBehaviour’ and ‘Debug’, they are not highlighted in green as usual.

This is happening with Visual Studio after I installed the new version 2019.2.14? How to fix it?

First, make sure your SomeClass class is saved as SomeClass.cs.

Yes, SomeClass has been saved as SomeClass.cs