it actually doesn't, just it's a pain in the ass to do it.
clear your ghost brick and toggle your weapons/tools to remove your brickweapon, then do it.
Wait, really? Huh I could have sworn that was working. I'll make sure to fix that.
Found a glitch. It keeps randomly saying "Building is currently disabled." when I do not even attempt to do anything with bricks.
Could you give more information on what actions/buttons trigger this?
Edit: looked into this
So the only two times this message will appear is when you try to toggle your inventory or open the brick selector while building is disabled (I should probably add a failsafe so you can close the inventory). You might be scrolling the mousewheel or something, which will attempt to open the inventory. Either that or the server is sending you commands to use an inventory slot. If not, more info is required.