Using these mods:

• Forge: 1.19.2-43.2.11
• Configured: 2.1.1-1.19.2
• Moonlight: 1.19.2-2.2.35-forge
• Supplementaries: 1.19.2-2.3.15

When you press the Supplementaries mod Config button in the Forge mod list menu nothing visibly happens. However, the following is logged in your logfile:
classcastexception.log

I was not entirely sure whether to report this here or on the Moonlight issue tracker. ¯\_(ツ)_/¯

fixed