PHPstorm suddenly not recognizing function param declarations
PHPStorm has worked flawlessly for me for years but it recently has stopped recognizing that I've declared function parameters:
I've tried Invalidating the Cache+restart and I've tried enabling->disabling Power save mode but neither resolves this *new* issue
Suggestions?

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We had an indexing issue in 2020.3 that was fixed in 2020.3.1: https://youtrack.jetbrains.com/issue/WI-57047
If you haven't yet upgraded, please do and run through caches invalidation again.
If it doesn't help, hover the pointer over the inspection hit and make a screenshot of the exact inspection message you get.