Environment

Windows 10.0.19041.0
Terminal 0.9.433.0
WSL 2, Ubuntu 18.04
Nerdfonts (FiraCode in this case, but it was the same for Cascadia Code PL)
Bash with Powerline Go
or ZSH with OhMyZSH and Powerline 10K

Steps to reproduce

Set a +25% display scaling (eg 125, 175, 225%) in Display Settings.
100, 150, 200 all seem fine

Expected behavior

Powerline Nerdfonts should display correctly:

Actual behavior

There are fine black lines between glyphs: