Touch keyboard does not show when text input is focused using touchscreen

### Describe the bug

Touch keyboard does not show when text input is focused using touchscreen. Observed on Windows 10 1809 build 17763.5329.

It only shows when manually invoke ITipInvocation.Toggle()

App was migrated from 1.5 where everything was working properly.

### Steps to reproduce the bug

1. Run WinUI app (WASDK 1.6.5) on Windows 10 1809 17763.5329
2. Touch TextBox using touch screen

### Expected behavior

Touch keyboard should be showed every time when text input is focused as on WASDK 1.5.

### Screenshots

_No response_

### NuGet package version

None

### Packaging type

Unpackaged

### Windows version

Windows 10 version 1809 (17763, October 2018 Update)

### IDE

Visual Studio 2022

### Additional context

_No response_

Start by reproducing the issue in the stated WinUI app configuration: WASDK 1.6.5, unpackaged, on Windows 10 1809 build 17763.5329. Compare touch focus on a TextBox with WASDK 1.5 and verify whether the touch keyboard appears without manually invoking ITipInvocation.Toggle(). Done means the keyboard appears whenever the text input is focused by touch.

Written by the indexing model from the issue text.