I have a couple mods installed on my server with friends, one of them picked inchling and the climbing perk doesnt work. I gave it a go and tried both buttons for abilities and nothing happens. Using fabric 1.16.5.

the arachnid climb doesn't work too, I have daemonic and requiem installed, could they be messing with it?

the issue was fallingtrees for some reason, removing this mod fixed it.