Subcatalog not creating

I know that plugin got a problem:
A small directory tree has already been created; there is a structure containing directories of the first, second and third levels. The problem with creating a subdirectory, under certain conditions. If we try to create a first level subdirectory from the root, everything works and we get a new folder, however, if we try to add a folder to the first level directory in which there are already three or four second level subdirectories, the plugin writes us that the folder has been added, but in fact nothing is added and there is no folder, when re-running, the same thing is no matter how you would call this folder, it is not created despite the fact that the plugin says it is being created. At this stage, the client has to create a folder from the root directory, and then move it to the directory in which it cannot create it as a subdirectory, according to its structure. Thought in the latest version this problem will be eliminated, but no. How to deal with such a bug?