Specifying json+pack or binary+pack when exporting using Spine 3.8.99 via CLI does not work

[misaki-eymard]

Description:
When exporting via CLI, you can specify -e json, -e binary, -e json+pack, or -e binary+pack to export with default export or pack settings, but for some reason this is not possible with Spine 3.8.99. Trying it outputs the following error:

ERROR: Error running legacy Spine launcher:
ERROR: Export settings JSON file does not exist:
<Path>/json+pack

This problem can be reproduced both using Terminal on macOS and Command Prompt on Windows.

Expected behavior:
You can specify -e json, -e binary, -e json+pack, or -e binary+pack to export with default export or pack settings with 3.8.99.

Workwround:
Exporting via CLI itself can be done as long as the path to the export settings JSON file is specified to -e.

Steps to reproduce:
Run the following command with any Spine project:

Windows:
Spine --update 3.8.99 \Path\SpineProject.spine --output \Path\Exported --export binary+pack

macOS:
/Applications/Spine.app/Contents/MacOS/Spine --update 3.8.99 --input /Path/SpineProject.spine --output /Path/Exported --export binary+pack

Version where this was tested and the bug is found:
Launcher v4.1.11

This issue was reported in the following post:
https://esotericsoftware.com/forum/d/23848-%E6%89%93%E5%8C%85%E5%9B%BE%E9%9B%86%E7%9A%84%E5%8F%82%E6%95%B0%E7%96%91%E9%97%AE

[NathanSweet]

The json, json+pack, json+atlas, binary, binary+pack, and binary+atlas shortcuts are an editor feature added in v4.0.66-beta, so I'm afraid they won't work in 3.8.99.