Changing TextBlock VerticalAlignment using styles overrides TextBox watermark VerticalAlignment in default theme

[Coding-Enthusiast]

Describe the bug
Changing TextBlock VerticalAlignment using styles also changes the TextBox watermark's VerticalAlignment. This only affects the default theme not fluent theme.
I believe it's because fluent theme already overrides the alignments (both horizontal and vertical) while default theme doesn't so it inherits it from higher.

To Reproduce

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="AvaloniaWatermark.MainWindow"
        Title="AvaloniaWatermark">

  <Window.Styles>
    <Style Selector="TextBlock">
      <Setter Property="VerticalAlignment" Value="Center"/>
    </Style>
  </Window.Styles>
  
  <TextBox Height="200" Watermark="Watermark"/>
  
</Window>

Expected behavior
The watermark should remain on top left corner regardless of what TextBlock style does.

Screenshots