Collections placed in a folder are alpha-sorted instead of order specified in Data Model list

[bcartier]

Preflight Checklist

• I have completed all Troubleshooting Steps.
• I'm on the latest version of Directus.
• There's no other issue that already describes my problem.

Describe the Bug

Manually changing the order in which collections appear via drag-and-drop works well, but if you create a folder and place collections inside, those collections are sorted alphabetically, not according to how you configure them in the drag-and-drop interface.

To Reproduce

1. Go to Settings > Data Model
2. Create a folder
3. Add more than one collection to the folder
4. Sort the collections via drag and drop
5. Visit the Collections module
6. Expand the folder to show nested collections
7. The collections appear in alphabetical order

Errors Shown

None

What version of Directus are you using?

v9.0.0-rc.98

What version of Node.js are you using?

14.18

What database are you using?

MySQL

What browser are you using?

Chrome 94.0.4606.81

What operating system are you using?

MacOS 11.6

How are you deploying Directus?

Docker via Rancher

[bcartier]

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