synthetics monitor status is always grey (skipped?)

[JulienOrain]

Kibana version: 8.17.1 (was also in 8.16.2)

Elasticsearch version: 8.17.1

Server OS version:

Browser version: Chrome/Safari

**Browser OS version:**last version

Original install method (e.g. download page, yum, from source, etc.):

On premise
Private location for synthetics

Describe the bug:
On the synthetics monitor page, the status is always grey

Steps to reproduce:

1. Go to Synthetics
2. Choose a monitor
3. See the status is grey (not colored by Completed/Failed status)

Expected behavior:

See the Completed/Failed colors

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context: