Laravel 5.7: Redis cache forget doesn't forget

I can confirm redis cache works for a set of items with dynamic keys like this:

$item = Cache::rememberForever('some_key_name_' . $itemId, function() use($itemId) {
    //return from DB...
});

I verify it by looking at the number of DB queries and they decrease. But when I update the item on admin panel, I want the item to be re-queried from database:

Cache::forget('some_key_name_' . $itemId);

What happens is the cache sticks, I see the old item and cache doesn't get cleared with this command.

I didn't use the tagged caching after some research revealed bugs on laravel's github page. What could be the issue with cache forget?

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