FilePicker: selectedNodes[0].extension is null

[Chartman123]

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Describe the bug In the Results view when you open the file picker, the file/folder list loads forever. The browser console shows the following error:

TypeError: selectedNodes[0].extension is null
    picker Results.vue:742
    dialogButtons FilePicker-kaHdQqaz.mjs:956
    VueJS 4
    render15 FilePicker-kaHdQqaz.mjs:1047
    VueJS 7
vue.runtime.esm.js:3065:16

To Reproduce Steps to reproduce the behavior:

1. Go to Results
2. Click on Create spreadsheet
3. See error

Expected behavior File Picker should load normally

Screenshots

Nextcloud (please complete the following information):

• Nextcloud-Version: 29/30
• Forms-Version: 4.3.0-alpha5

Additional context Probably a regression in @nextcloud-dialogs or @nextcloud-vue