drush fa-download not working

Yes, I'm running drush from web root in the above example. I can use all other drush commands from this directory without any problems. It just looks like drush does not recognize the fa-download command. Cache was rebuilt.

I also tried the same on a fresh install, but here with another Drush and Drupal (8.6.x-dev) version:

drush --version
Drush Launcher Version: 0.6.0
Drush Commandline Tool 9.5.2

With this combination I get another problem. After installing the module with composer I can successfully execute drush fa-download (or fa:download). The library is downloaded but I get the error "failed to open dir: No such file or directory. Here's what I'm doing:

composer require drupal/fontawesome
Using version ^2.9 for drupal/fontawesome
./composer.json has been updated
No patches supplied.
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
No patches supplied.
Gathering patches for dependencies. This might take a minute.
  - Installing drupal/fontawesome (2.9.0): Downloading (100%)         
Writing lock file
Generating optimized autoload files

drush en fontawesome -y
[success] Successfully enabled: fontawesome

At this point no libraries directory exists in my web root.

drush fa-download
In Filesystem.php line 562:                                                                                                                                                     RecursiveDirectoryIterator::__construct(/var/www/drupal/public_html/libraries/fontawesome/fontawesome-free-5.5.0-web): failed to open dir: No such file or directory

After this the directory ./libraries/fontawesome exists, but it also contains another directory fontawesome-free-5.3.1-web. This directory contains all files of the fontawesome library.

Note, that the error message states fontawesome-free-5.5.0-web and the directory that was created is fontawesome-free-5.3.1-web.

fontawesome.libraries.yml refers to version 5.3.1:

fontawesome.svg:
  remote: https://use.fontawesome.com/releases/v5.3.1/fontawesome-free-5.3.1-web.zip
  license: &fontawesome_svg_license
    name: CC BY 4.0
    url: https://fontawesome.com/license
    gpl-compatible: true
  version: &fontawesome_version "5.5.0"
  js:
    /libraries/fontawesome/js/all.js: { minified: true }

Yes, fixes the problem I had on the fresh install mentioned in #3.

Haven't tried on the site mentioned in #1 but I'm pretty sure, this patch won't fix the initial issue. Also a reinstall of the module doesn't fix the problem on the other site, which is also "pretty fresh", just a few contrib modules installed so far.

Applied the patch on the site from #1. Does not fix the problem.

drush fa-download
The drush command 'fa-download' could not be found.  Run `drush cache-clear drush` to clear the commandfile cache if you have installed new[error]
extensions.

But as mentioned above, the patch from #4 fixes the problem described in #3 on a fresh install with newer drush version.

Might this be a compatibility issue with older drush version?