Intellisense Failure
Hello
I have just done an update to the latest PHPStorm and now it is not showing certain classes in intellisense.
Here is the example I am set to PHP 7.2 in the interpreter.

Doesn't detect class

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Is there any specific reason why are you importing the namespace, not a class?
Does the "use Testing\Intelli\TestTest" work?
These classes are even in the same namespace and it still gives me this issue.
I'm not sure it's related, at least it looks so. For me it usually works but then unexpectedly stops providing intellisense support only for certain classes! Please have a look at the screenshots attached. I'm very keen to submit a bug report but decided to post here just in case someone knows if it's a "known issue" (even though I've checked them and couldn't find my specific case).
I was wondering if you have already tried the "Invalidate Caches" operation. Just in case, here is the link:
https://www.jetbrains.com/help/phpstorm/invalidate-caches.html
I certainly did Vasiliy Yur, but thanks anyway.
It did help once, but then after some time it was all back to unknown classes. Really strange. It can't be my SSD failure in the index file zone, can it?
If it is happening again after the Caches Invalidation, chances are high that you are experiencing the following issue:
https://youtrack.jetbrains.com/issue/WI-57047
The possible fix will be available in the PhpStorm 2020.3.1 Preview build that is about to be released very soon (hopefully, today).