Chromium can't connect to ibus in firejail

I can’t type in the application window. In the terminal is printed:

Warning: not remounting /var/lib/docker/btrfs
Warning: not remounting /var/lib/docker/btrfs
Warning: An abstract unix socket for session D-BUS might still be available. Use --net or remove unix from --protocol set.
Failed to connect to the bus: Failed to connect to socket /run/firejail/mnt/dbus/system: Permission denied
[<timestamp>:ERROR:bus.cc(399)] Failed to connect to the bus: Failed to connect to socket /run/firejail/mnt/dbus/system: Permission denied
[9:43:0809/155552.447315:ERROR:bus.cc(399)] Failed to connect to the bus: Failed to connect to socket /run/firejail/mnt/dbus/system: Permission denied
[9:9:0809/155552.473292:ERROR:chrome_browser_cloud_management_controller.cc(162)] Cloud management controller initialization aborted as CBCM is not enabled.

A related issue, the group firejail doesn’t appear to be created by default on Fedora:

$ groups
user wheel docker

Firefox seemingly has no firejail-related issues on Fedora.