Environment

Windows build number: Microsoft Windows [Version 10.0.19041.21]
Windows Terminal version (if applicable): 0.8.10091.0

Any other software?  WSL, Ubuntu

Steps to reproduce

I have TERM set to xterm-24bit using the standard termconfig instructions that are online. Running emacs in terminal mode (emacs -nw) and then using M-x list-display-colors

Behavior (windows terminal on the left, wsltty on the right)

In both cases, emacs knows about all 500+ colors available, but wsltty shows them and windows terminal doesn't. Also this has been like this for a couple months at least, but now it's bugging me enough to ask for a fix. :)