Export Project -> Import project: missing things: avatar, lists, project settings
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=570935)
</details>
<!--IssueSummary end-->
### Summary
When exporting a project and importing that same project in the same version of Gitlab (currently 18.2), a lot of things are suddenly missing.
This behavior was not seen before in version 15.
### Steps to reproduce
Click on Project -> Export
Then Projects -> New Project -> Import -> From Gitlab Export
### Example Project
File is [2025-08-29_13-15-759_ontwikkeling_ICTJOU_export.tar.gz](/uploads/526e893a68b6b2069b17970a2a970803/2025-08-29_13-15-759_ontwikkeling_ICTJOU_export.tar.gz)
It has
* ~~avatar~~ (already covered in https://gitlab.com/gitlab-org/gitlab/-/issues/516092+)
* boards with a "doing" list
* Project settings (disabled features as Automate etc disabled)
### What is the current *bug* behavior?
Avatar is not imported
Lists in Boards are not imported
Project-settings are not imported
### What is the expected *correct* behavior?
Avatar is imported from file
Lists in Boards are imported
Project-settings are imported
### Relevant logs and/or screenshots
It worked on previous versions
issue