Cant build on Nether Roof on purpur 1.21.1 Server

Hi, My friend has a purpur 1.21.1 server with some plugins. Something is resisting building blocks on the nether roof. If you place a block on the nether roof it will get quickly removed with no messege shown. My friend is to lazy to fix this issue so i took it in my own hands. If I wont provide enough information I will ask my friend / add him to this thread. I provided a list of the plugins on his server in the Image. I had also included the purpur.yml file (It the messege.txt file).
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message.txt53.61KB
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