Xdg-open cannot open a file in the runtime:/tmp directory

1

Nothing happened after executing xdg-open /tmp/file1.

No AppChoose pop-up appeared.

2

Tests show that the directories that cannot be opened overlap with those allowed by the --filesystem option.

However, xdg-open only opens files internal to the runtime, not the host file. Permissions are irrelevant.

I believe this is a bug.