android studio: SnackBar is beneath visable screen - android-studio

Question

i am having trouble with the Snackbar. I recently moved to Kotlin, Electric Eel and Material design 3. So it is a problem to pinpoint the source of the problem.
So in my main activity i have this XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/rootContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/barLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#+id/barLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
tools:layout="#layout/fragment_dummy" />
</androidx.constraintlayout.widget.ConstraintLayout>
Then in my Kotlin MainActivity.kt i do this:
fun deleteItem(position: Int) {
val lDeletedItem = mAdapter.removeItem(position) ?: return
val message = Snackbar.make(binding.rootContainer, R.string.DialogDeleteTripMessage, Snackbar.LENGTH_LONG)
message.setAction(R.string.DialogDeleteTripButton) { view ->
mAdapter.addItem(position,
lDeletedItem
)
}
message.setActionTextColor(Convertor.ResourceToColorInt(this, R.attr.colorSnackBarAction))
message.addCallback(object : Snackbar.Callback() {
override fun onDismissed(transientBottomBar: Snackbar, event: Int) {
if (event == DISMISS_EVENT_TIMEOUT) {
mViewModel.deleteItem(lDeletedItem.id)
}
}
})
message.show()
}
Everything works just fine but the Snackbar is display outside the visible screen:
Anybody an idea? did the same thing before and then is was working but changed so many things that i am lost