PhpStorm find normal code as wrong code and invalidate cache not working.
Somehow, phpstorm acting weird. "Missing function's return type declaration" is not going away even if there IS a return type declaration.
Catch thowable exceptions for comment is able to repeat. Function name detected as a typo character by character .. and so on..
Invalidate cache DO solve the problem in a minutes. Problem happens immediate after writing other code.
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First of all, please try disabling all custom plugins at Settings | Plugins > click on a gear icon > "Disable All Downloaded Plugins", restart IDE and check the issue after that. Perhaps one of the 3rd party plugins is causing that.
Then, is it a locally stored project? Or it's a project on a mounted network disc or something similar?