Fzzy Config 0.5.3
Minecraft 1.20.1
Forge 47.2.8

Running /reload fails, and the server log contains the following error message:

java.lang.NoSuchMethodError: 'java.util.List net.minecraftforge.event.OnDatapackSyncEvent.getPlayers()'
        at TRANSFORMER/[email protected]+1.20.1+forge/me.fzzyhmstrs.fzzy_config.networking.NetworkEvents.registerDataSync(NetworkEvents.kt:122)

It looks like getPlayers() was added in Forge 47.3.

So this is kind of on me for using an out of date version of Forge, but if Fzzy Config is only compatible with a later version of Forge I would expect it to complain at startup.

fixed in 0.5.4

Thanks for letting me know. I'll tweak the dependency to be 47.3 and up in 0.5.4