WPF RestoreInputLanguage="True" does not revert to the previous language

### Description

Product Info

Windows/.NET Versions

.NET 6 on Windows 10, Windows 11

Visual Studio Version 2022

Workarounds?
A possible workaround is to set the InputLanguage for all elements that require language specification. However, it is very difficult to set it back to an infinite number of elements.

Scope

What are the .NET Framework versions, OSes & component/binaries affected?
Windows 10 version 22H2 & Windows 11

.NET 6

Is this a regression (when was it introduced)?
No, .NET Framework 4.8 behaved the same as .NET 6.

Issue Info

Problem Description
Setting RestoreInputLanguage to True should revert to the language in which it was focused when focusing out of the element, but the steps below will not revert to it. The framework needs to move back to the language for each element and then move on to the next element, but it seems to remember the only one previous language.

Steps to Repro

Before you begin, you need to install two keyboards, en-us and ja-jp.

1. Run the sample I attached

2. Click "1 (none)" TextBox

3. Switch the keyboard to ja-jp with Win+Space, etc.

4. Click "2 (en-us)" TextBox

5. Click "3 (en-us)" TextBox

6. Click "5 (none)" TextBox

Expected Results

==============

Reverted to ja-jp switched in Step 3

Actual results

============

It remains en-us.

Click 1 → 2 → 5 to return to ja-jp. Regardless of the previous language, click 4 → 2 → 5 to return to ja-jp. So it looks like the framework only remembers one time ago.

Workarounds attempted

Setting InputLanguage for all elements that require a language specification is not acceptable to the customer.

### Reproduction Steps

Before you begin, you need to install two keyboards, en-us and ja-jp.

1. Run the sample I attached

2. Click "1 (none)" TextBox

3. Switch the keyboard to ja-jp with Win+Space, etc.

4. Click "2 (en-us)" TextBox

5. Click "3 (en-us)" TextBox

6. Click "5 (none)" TextBox

Expected Results

==============

Reverted to ja-jp switched in Step 3

Actual results

============

It remains en-us.

### Expected behavior

Expected Results

==============

Reverted to ja-jp switched in Step 3

### Actual behavior

Actual results

============

It remains en-us.

### Regression?

No

### Known Workarounds

Setting InputLanguage for all elements that require a language specification is not acceptable to the customer.

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_