Android Jetpack Compose中ExposedDropdownMenu展开时无法对输入框的内容做删减

Question

代码

这里就直接用官方的代码做实验了
https://developer.android.google.cn/reference/kotlin/androidx/compose/material/package-summary?authuser=0#ExposedDropdownMenuBox(kotlin.Boolean,kotlin.Function1,androidx.compose.ui.Modifier,kotlin.Function1)

官方代码

import androidx.compose.material.DropdownMenuItem
import androidx.compose.material.ExposedDropdownMenuBox
import androidx.compose.material.Text
import androidx.compose.material.TextField
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember

val options = listOf("Option 1", "Option 2", "Option 3", "Option 4", "Option 5")
var expanded by remember { mutableStateOf(false) }
var selectedOptionText by remember { mutableStateOf("") }
ExposedDropdownMenuBox(
    expanded = expanded,
    onExpandedChange = {
        expanded = !expanded
    }
) {
    TextField(
        value = selectedOptionText,
        onValueChange = { selectedOptionText = it },
        label = { Text("Label") },
        trailingIcon = {
            ExposedDropdownMenuDefaults.TrailingIcon(
                expanded = expanded
            )
        },
        colors = ExposedDropdownMenuDefaults.textFieldColors()
    )
    // filter options based on text field value
    val filteringOptions =
        options.filter { it.contains(selectedOptionText, ignoreCase = true) }
    if (filteringOptions.isNotEmpty()) {
        ExposedDropdownMenu(
            expanded = expanded,
            onDismissRequest = {
                expanded = false
            }
        ) {
            filteringOptions.forEach { selectionOption ->
                DropdownMenuItem(
                    onClick = {
                        selectedOptionText = selectionOption
                        expanded = false
                    }
                ) {
                    Text(text = selectionOption)
                }
            }
        }
    }
}

实现效果

问题

当下拉选项框是展开状态时，不能对输入框做删减，但是可以输入新的字符上去，这难道是ExposedDropdownMenu的特性吗QAQ

想要的效果

下拉选项框是展开状态时也能对输入框做删减