Firebase-tools: Firebase emulates functions and hosting can't be run together

[REQUIRED] Environment info

firebase-tools: 6.9.0

Platform: Fedora 30

[REQUIRED] Test case

Work on default project from firebase init command

[REQUIRED] Steps to reproduce

Run firebase serve --only functions,hosting

[REQUIRED] Expected behavior

$ firebase serve --only functions,hosting

=== Serving from '/mnt/Data/Projects/Dir/project'...

i  functions: Preparing to emulate functions.
i  hosting: Serving hosting files from: public
✔  hosting: Local server: http://localhost:5000
✔  functions: ssr: http://localhost:5001/<project-id>/us-central1/ssr

[REQUIRED] Actual behavior

$ firebase serve --only functions,hosting

✔  functions: ssr: http://localhost:5001/<project-id>/us-central1/ssr

Note:
It worked on version 6.8.0