TextBox MaxLength doesn't work on Win10 w/ "." character

[Foda]

Describe the bug

On Windows 10, setting MaxLength on a TextBox doesn't properly limit the "." character. If you set the MaxLength to 5, you can insert a few more than that.

We're seeing this issue pop-up in MAUI: https://github.com/dotnet/maui/issues/19853

Steps to reproduce the bug

1. Make sure you're on Windows 10 (it works fine in Win11)
2. Add the following: <TextBox MaxLength="5"/>
3. Try and add more than 5 "." characters
4. Observe that more than 5 characters are added

Expected behavior

TextBox should limit the number of characters regardless of which character it is

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.5.1: 1.5.240311000

Windows version

Windows 10 (21H2): Build 19044

Additional context

No response

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