Crash when adding NexusMods API key, qt.xkb.compose: failed to create compose table

[mattmcadoo]

xkbcommon: ERROR: couldn't find a Compose file for locale "C.UTF8" (mapped to "C.UTF8")
qt.xkb.compose: failed to create compose table
terminate called after throwing an instance of 'std::length_error'
  what():  basic_string::_M_create
Aborted (core dumped)

limo-1.0.11
loot-0.24.5
cpr-1.11.1

The API token I got from NexusMods is 93 characters long.

Running on Gentoo and it does not have a complete dedicated set of Qt5 libraries around, most of the core packages have been updated to Qt6 (6.8.1). There is a Qt5compat module for Qt6 that is for using the older version's API along with other Qt5 packages that are for specific functions.

Also, this system is running Wayland but does have libxkbcommon (1.7.0) installed.