Hashmap Object Saved In Cloud Firestore With Field Names As Letters Insted Of Informed Names

I'm programming a android app in Kotlin and having troubles with document add to Cloud Firestore. When testing the app in android studio AVD Emulator it goes alright and saves as e

Solution 1:

Issue: Don't know, technically, what happens, but the issue is that: When generate apk with "proguard minify" set to "true" it loses references of objects classes and saves fields names as letters. When set to "false" it goes normally with correct object properties names.

Answer : So, for now, the solution is: Generate always the apk with proguard minify set to false in this particular app case.