Android平台团队并没有彻底弃用toasts，而是逐渐降低它们的有用性，这是弃用的一种形式。
https://developer.android.com/reference/android/widget/Toast
最后一句说：Starting with Android 12 (API level 31), apps targeting Android 12 or newer will have their toasts limited to two lines.
如果我需要多行消息，我个人会使用Snackbars。

val SNACKBAR_MAX_LINES = 8 // Increase maximum SnackBar line limit above 2
val snackbar = Snackbar.make(bottomNavigationView, "message", Snackbar.LENGTH_SHORT)
            (snackbar.view.findViewById(com.google.android.material.R.id.snackbar_text) as TextView)
                .run {
                    maxLines = SNACKBAR_MAX_LINES 
                }

snackbar.show()

也许这可以是一个变通的办法。尝试创建一个自定义的吐司消息。我尝试用PopupWindow创建一个。这个类的setContentView方法可以用来设置自定义布局，从而可以支持多行文本。
Android上的自定义吐司：简单的例子
如果你想通过在应用程序的Application类中创建一个方法来使它成为一个通用的方法。下面是代码。

class ApplicationClass() : Application(), Application.ActivityLifecycleCallbacks {
    private var activityReference: Activity? = null

    override fun onCreate() {
        super.onCreate()
        registerActivityLifecycleCallbacks(this)
    }

    fun showCustomToast(toast: String) {
        try {
            activityReference?.window?.decorView?.let {
                val popupWindow = PopupWindow(it.width - 200, ViewGroup.LayoutParams.WRAP_CONTENT)
                val binding = GenericToastPopupBinding.inflate(LayoutInflater.from(this))
                binding.toastMessage.text = toast
                popupWindow.contentView = binding.root
                binding.close.setOnClickListener {
                    popupWindow.dismiss()
                }
                popupWindow.setBackgroundDrawable(
                    ContextCompat.getDrawable(
                        this,
                        R.drawable.bg_rectangle_white
                    )
                )
                popupWindow.animationStyle = android.R.style.Animation_Toast
                popupWindow.showAtLocation(it, Gravity.BOTTOM, 0, 500)
                MainScope().launch {
                    delay(5000)
                    popupWindow.dismiss()
                }
            }

        } catch (e: Exception) {
            Log.d("TAG", "showCustomToast: ")
        }
    }

    override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
        activityReference = activity
    }

    override fun onActivityStarted(activity: Activity) {
        activityReference = activity
    }

    override fun onActivityResumed(activity: Activity) {
        activityReference = activity
    }

    override fun onActivityPaused(activity: Activity) {
       
    }

    override fun onActivityStopped(activity: Activity) {
       
    }

    override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {
     
    }

    override fun onActivityDestroyed(activity: Activity) {
      
    }
}