Plants generation in nether/block place a structure on server

Hello, I would like to report a bug in 1.17.1 with the Mcreator 2021.3 b45419 version. When you create a plant and select it to appear in the nether and launch the game, the plant does not appear, which is problematic.

There is also a second bug, when we launch the server version of Mcreator, all the blocks that place structures make the server crash. Here is the crash report