linux penguin icon not showing up (windows 11) and i can't acess ubuntu if i fix it in the sidebar, only if i type it at the top

### Windows Version

Microsoft Windows [Version 10.0.26200.8037]

### WSL Version

2.6.3.0

### Are you using WSL 1 or WSL 2?

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

6.6.87.2-1

### Distro Version

Ubuntu 24.04

### Other Software

_No response_

### Repro Steps

i made a backup before updating to windows 11, then imported it using wsl --import Ubuntu C:\WSL\Ubuntu "C:\Users\MyUsername\Downloads\backup.tar"

### Expected Behavior

i was expecting to see a little penguin icon in the explorer sidebar

### Actual Behavior

nothing shows up

### Diagnostic Logs

_No response_

Reproduce the reported case using the `wsl --import Ubuntu C:\WSL\Ubuntu ...` command on Windows 11, then check the Explorer sidebar and its ability to open Ubuntu. Trace the WSL integration involved in displaying imported distributions and confirm that the icon and sidebar access work after the change.

Written by the indexing model from the issue text.