IssueTracker

Here's just a custom text field that just uses a CoreTextField inside:

@OptIn(InternalTextApi::class, ExperimentalFoundationApi::class)
@Composable
fun MyTextField(value: String, onValueChange: (String) -> Unit) {
    var selection by remember { mutableStateOf(TextRange.Zero) }
    var composition by remember { mutableStateOf<TextRange?>(null) }
    val textFieldValue = TextFieldValue(
        text = value,
        selection = selection.constrain(0, value.length),
        composition = composition?.constrain(0, value.length)
    )

    CoreTextField(
        value = textFieldValue,
        onValueChange = {
            selection = it.selection
            composition = it.composition

            if (textFieldValue.text != it.text) { // <---- this is problematic
                onValueChange(it.text)
            }
        },
        modifier = Modifier.background(Color.Green).height(30.dp)
    )
}

We call it like this

var text by remember { mutableStateOf("A") }
MyTextField(text, onValueChange = { text = it })

If you run the snippet above, you'll see the text field with "A" entered. Now, if you add additional letter "B", you'll see "AB".

What's wrong:

If you try to delete this last entered letter "B", visually nothing happens. This is because we won't get inside the "if block" because the textFieldValue.text value captured by the lambda is equal to "A".

So it looks like lambda captures old value.