Minecolonies version: 1.12.2-0.10.282-ALPHA-universal.

Expected behavior
Having ensured that there is a 17x17 area of grass with 1 layer of pure dirt 1 block below (as suggested on the thread for Issue #1544), and with no ferns, flowers, long grass etc, I place the Supply Camp.

Actual behaviour
I use the Builder's Tool to position the Supply Camp where I want it to go but after clicking the green tick it then disappears without any sort of error message or explanation.

Steps to reproduce the problem
Copy what I outlined and pictured above?

(thank you)

The supply camp/ship are the only things you shouldn't use the build tool to place =) Just put the camp or ship straight onto the ground/water.
There's a decoration of each one that you use the build tool for, but for placing it to start you just place the block (in theory you shouldn't have a build tool until you have placed the camp, and receive the tool and townhall hut block from the camp =))

@ASimpleEgg you cannot use the build tool to place the supply schems. please use their respective items