Collapsed left-side panel is broken
### Summary
After merging https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62486 we have a visual regression for the left-and panel n collapsed state.
### Steps to reproduce
- open a list of issues in a project on gitlab.com
- collapse the left-hand panel
- watch the panel nopt fully collapsed with the sub-menu still being visible in the panel
### What is the current *bug* behavior?
The panel doesn't get collapsed properly
### What is the expected *correct* behavior?
The panel gets collapsed and no sub-items are permanently visible
### Relevant logs and/or screenshots
| Before https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62486 ([Commit: 6a5b7b00a78286127850a856334403db08e658c2](https://gitlab.com/gitlab-org/gitlab/-/commits/master?utf8=%E2%9C%93&search=Allow+%22Prev%22+and+%22Next%22+buttons+to+be+translated)) | After https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62486 ([Commit: 7686659874efb64679316149413c122fc5bde9c6](https://gitlab.com/gitlab-org/gitlab/-/commits/master?utf8=%E2%9C%93&search=Merge+branch+%27ps-update-startup-css%27+into+%27master%27)) |
| ------ | ------ |
|  |  |
### Output of checks
This bug happens on GitLab.com
issue