Changing the lock orientation on key press instantly disconnects you from the server, and yes "client server too"

forge-14.23.2.2617
Quark-r1.4-122.jar

Also seeing this behavior, as is everyone else on our server.

• FTB Revelation 1.5.0 -> Quark-r1.4-122.jar
• forge-1.12.2-14.23.2.2613-universal.jar
• spongeforge-1.12.2-2611-7.1.0-BETA-2953.jar

If I can catch a stacktrace when it happens I'll update my comment here

I'd like to add that we are experiencing this issue as well. I will follow up with an error log shortly
FTB Revelation 1.6.0
forge-1.10.2-12.18.3.2477-universal
spongeforge-1.12.2-2611-7.1.0-BETA-2970
Quark-r1.4-122
AutoRegLib-1.3-15
EDIT: Error log when pressing the key for Lock Orientation
https://pastebin.com/pXYNfJfx

Looks like an issue with sponge, I'd report it to them.