Unexpected deletion related to local directory

[sirasagi62]

If a local directory is specified as the plugin path, and that directory is not managed by Git, running :JetpackSync will delete that directory.

It appears that the 'jetpack#clean_plugins()' function, which should only apply to remote plugins, is also being applied to local folders.

Reproduction Code

packadd vim-jetpack
call jetpack#begin()
Jetpack 'tani/vim-jetpack'

" ~/path/to/dir will be deleted.
Jetpack '~/path/to/dir'

" DO NOT EXECUTE:
" If you execute this, all of the user's home directory will be deleted.
"Jetpack '~'
call jetpack#end()

Note

I was unable to find information regarding the behavior when specifying a local directory in the README or help files.