Region invalidation malfunctioning after text buffer has begun to scroll

[oising]

Windows Terminal version (or Windows build number)

1.11.2421.0

Other Software

• Windows 11 / 21H2 / 22000.132

Steps to reproduce

• open powershell (could be another shell)
• execute "ls" / "dir" a few times until the text buffer has begun to scroll

Parts (or the entirety) of the buffer should be invisible, yet will be rendered visible if selected with the mouse

e.g.

after selection:

Expected Behavior

• text rendered correctly 💩

Actual Behavior

• text rendered incorrectly

[jessey-git]

I've also been seeing this since moving to 1.11 preview (usually with various git commands for me). I didn't notice at all in the 1.10 preview so perhaps a regression.