Found two getters or fields with conflicting case sensitivity for property, Once minifyEnabled to True

Question

Can anyone help me in changing the proguard rules to solve this error.

I am using cloud firestore and I am doing below query on firestore to fetch data into recylerview.

 Query query = GlobalState.firebaseDB().collection("HOSPITALS")
 .orderBy("DATE_OF_VISIT",Query.Direction.DESCENDING)
 .whereEqualTo("CITY",GlobalState.myfriend.getCityname());

Once I enabled minifyEnabled True, I am getting below error.

java.lang.RuntimeException: Found two getters or fields with conflicting case sensitivity for property: city

And also I have created setters and getters methods from Android studio's built-in functionality and all my fields in the model class are private, still it throws the same error.

public class HospitalModel {

    private String CITY;
    

    public String getCITY() {
        return CITY;
    }

    public void setCITY(String CITY) {
        this.CITY = CITY;
    }

    
}

For my requirement, I cannot change the fields in firebase to smallletters.

Proguard rules

-keepclassmembers class com.icare.startup.HospitalModel { *; }