Renaming of projects in subfolders does not work

[tukusejssirs]

Short and descriptive example bug report title

When I save a project into [subl_config]/Packages/User/Projects/[any_folder], it works as expected. Project Manager displays [any_folder]/[project_name] as project name.

However, when I try to rename a project into such a folder, that folder ([any_folder]) is removed and the renaming fails (the project is not renamed).

Some log I got from ST3 console (ustd = [any_folder]:

Traceback (most recent call last):
  File "/home/ts/.config/sublime-text-3/Installed Packages/ProjectManager.sublime-package/project_manager.py", line 451, in rename_callback
FileNotFoundError: [Errno 2] No such file or directory: '/home/ts/.config/sublime-text-3/Packages/User/Projects/ustd/ustd.sublime-project'

Environment

ProjectManager:
    version: 0.7.19
    installed via Package Control: True

Sublime Text:
    channel: stable
    version: 3211
    platform: Linux (Fedora 32)
    portable: no
    architecture: x64