Compose TextField clears value on gaining focus

I have a Composable function which displays 2 TextFields. Here's my code:

fun CreateEntryItem() {

    var wordA by remember { mutableStateOf("") }
    var wordB by remember { mutableStateOf("") }

    Column {
        Row {
            TextField(
                value = wordA,
                onValueChange = { wordA = it },
                enabled = true,
                modifier = Modifier.weight(1f)
            )
            TextField(
                value = wordB,
                onValueChange = { wordB = it },
                enabled = true,
                modifier = Modifier.weight(1f)
            )
        }
    }
}

When I give focus to TextField A, I can type and the value of wordA updates correctly.

Here's the weird behaviour:

I then give focus to TextField B. I then give focus back to TextField A. When I start typing, instead of TextField A inserting / appending characters at the cursor position in the existing text, it completely clears the existing text (as set pre-focus), and 'starts afresh'. That is to say, each TextField only remembers text entered in the current 'focus session'.

Am I doing this wrong? Or is this a bug in Compose? I reproduced this behaviour on both 1.0.0-beta07 and 1.0.0-beta08.