file is downloaded by eTag condition but not updated in cache

## 🐛 Bug Report

1. Load a file image with max-age = 5 second (there is overriden value of 0 seconds with 7 days - which is not good actually).
2. Replace file on server with new one
3. Reload image

Actual result:
it is visible that code 200 is coming from file download, file is actually downloaded, but memory cache not updated, old file is added to stream produced by getFileStream(url) method (the last one, the first one is from memory cache which is OK).
App restart helps to see new file (code 304 is reported by server, file is not actually downloaded).

Inizia dal punto di ingresso getFileStream(url) e segui il percorso intrapreso dopo una risposta 200 dal server. Verifica come il file scaricato aggiorna la cache in memoria, quindi verifica che un nuovo caricamento dopo la sostituzione del file sul server produca il nuovo contenuto nello stream senza riavviare l’app.

Scritto dal modello di indicizzazione a partire dal testo della issue.