android-flex-grow-bug.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:layout_width="match_parent"
             android:layout_height="match_parent"
             xmlns:app="http://schemas.android.com/apk/res-auto"
             android:background="#fff"
             xmlns:android="http://schemas.android.com/apk/res/android">
        
<com.google.android.flexbox.FlexboxLayout
    android:layout_width="match_parent"
    android:background="#ccc"
    android:layout_height="wrap_content">
        
        <FrameLayout
            android:background="#6495ed"
            android:layout_width="0dp"
            app:layout_flexGrow="1"
            android:padding="8dp"
            app:layout_alignSelf="center"
            android:layout_height="wrap_content">
                <TextView
                    android:background="#c0c"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="sometesttext"
                    />
        </FrameLayout>

        <FrameLayout
            android:background="#6495ed"
            android:layout_width="0dp"
            app:layout_flexGrow="1"
            android:padding="8dp"
            app:layout_alignSelf="center"
            android:layout_height="wrap_content">
                <TextView
                    android:background="#c0c"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="sometestt"
                    />
        </FrameLayout>
        
</com.google.android.flexbox.FlexboxLayout>

</FrameLayout>