Cannot open any files with external program with latest Zotero flatpak package on Manjaro

Report ID: 206998418
Debug ID: D1934545183

Since recently, I can neither open pdf files nor use “Show File” nor open any other file with an external program.

Steps to reproduce:
1. Start Zotero with `flatpak run org.zotero.Zotero`
2. Set in Edit - Preferences - Open PDFs using to "System Default"
3. In My Library select item with pdf attached
3. Right click
4. Click on
a) Open PDF
b) View Online
c) Show File

None of the above options work for me with latest flatpak, maybe because it does not have access to the corresponding files in `/usr/bin`? But even if running starting with
`flatpak run --filesystem=host org.zotero.Zotero` it does not find the proper applications. Following the error output on the command line:
```
** (zotero:5): WARNING **: 15:04:10.870: Cannot launch default application: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.OpenURI” on object at path /org/freedesktop/portal/desktop
Failed to call portal: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface ?org.freedesktop.portal.OpenURI? on object at path /org/freedesktop/portal/desktop
```
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