Box drawing characters are not antialiased

Environment

Windows build number: Microsoft Windows [Version 10.0.18362.592]
Windows Terminal version (if applicable): Version: 1.0.1401.0
Any other software? No.

Steps to reproduce

1. Install the latest 1.x version of Windows Terminal and open a WSL terminal.
2. Download and display the UTF-8 Demo Text, for an example
   $ curl https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt

Expected behavior

The box drawings are properly rasterized with antialiasing in similar fashion to the rest of the text. Here is an example from Fluent Terminal using the Inconsolata font:

(Note: I'm not necessarily saying this is perfect either, but it's at least closer to what would be an acceptable and more consistent result.)

Actual behavior

The box drawing glyphs are severely aliased, unlike any other text, with visible pixel gaps in diagonal elements, and generally just look really bad. Rendered in the latest stable Windows Terminal version using the Inconsolata font (size 10pt):

This behavior is not just limited to Inconsolata, but happens with every font, and every size. Here is for an example Cascadia Mono in different sizes:
8pt

10pt

12pt

This behavior was introduced recently in the RC versions, and I assume 0.11.1333.0 in specific since it included #5743 which altered the way box drawing glyphs were handled. Prior versions had alignment issues with these glyphs that the PR aimed to fix, but at least the glyphs were still rendered nicely individually, with a similar, comparable output to what Fluent Terminal produces.

The issue names no source files, tests, or entry points. First reproduce the rendering problem in Windows Terminal with the UTF-8 Demo Text and compare fonts and sizes; done means box-drawing glyphs render with antialiasing and without visible pixel gaps, while preserving their alignment.