Wrong undercurl colors

[mintelm]

Description

I am not sure if this is actually related to the theme or just my configuration, but I have the wrong undercurl colors when using tmux + neovim + catppuccin.

I attached some screenshots to show my highlighting with and without tmux.

Neovim version

NVIM v0.10.3
Build type: RelWithDebInfo
LuaJIT 2.1.1731601260

Terminal and multiplexer

Windows Terminal Version: 1.21.3231.0 and tmux 3.5a

Catppuccin version / branch / rev

f67b886

Steps to reproduce

I use the following tmux configuration:

set -g default-terminal "tmux-256color"
set -sg terminal-overrides ",*:RGB"
set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm' # undercurl support

The screenshot provided uses clangd and lspconfig to create the diagnostics.

Expected behavior

The expected behavior is the following:

The undercurls with tmux simply use the highlighting of the text instead of using their own color like without tmux.

Actual behavior

This is the behavior using tmux:

Repro

No response