How to Monitor token refresh on android/ios using this plugin

Currently I have a issue in my capacitor ios/android app using this plugin, the fcm Token stays valid for few hours and then it becomes invalid so cannot deliver push notifications due to this, and I dont see a listener or a way to get notified about token refreshes.

Also the refreshToken() functions returns same old token and after 20-30 secs, it should return the new token on IOS, why is that?