[Question] I can't forget a specific URL

[Psabot]

Hello,

I have an issue on my side I can't wrap my head around.

I used the middleware on the following route

Route::get('/post/{slug}', [BlogController::class, 'showPost'])->middleware('cacheResponse')->name('blog.showpost');
It works well, the response is cached when I hit http://mywebsite.com/post/example

Then, when I want to forget the cache for a specific URL, I'll call this function

public function forgetCache($slug): JsonResponse
    {
        ResponseCache::selectCachedItems()->forUrls('/post/'.$slug)->forget();
     ....
    }

But this code does not forget the URL with the specified slug ("example" as per my previous example) ... (it works well with ResponseCache::clear(); but I don't want to wipe everything)
The slug is obviously the same. I'm sure I'm missing something obvious but I don't understand what at this moment.

Any help would be appreciated ! Thanks a lot !

EDIT : it WORKS when I return an empty string in useCacheNameSuffix but I thought selectCachedItems was the way to get around the suffix ?