Sightings tab under Observables and Indicators shows no data

[annoyingapt]

Description

If I create an indicator and if I create a sighting to an organization, I used to be able to see this sighting from the sighting tab under the indicator. I never done sightings for observables, but I assume it should work the same way.
I can see the sightings under Events -> Sightings, but if I drill down to the indicator, the sighting is not there.

Environment

1. OS (where OpenCTI server runs): Ubuntu 24.04
2. OpenCTI version: 6.3.5
3. OpenCTI client: frontend

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. Create indicator
2. Create organization
3. Create sighting from organization
4. Try to pivot to indicator and check sighting tab

Screenshots

[nino-filigran]

The fix should be at least to view the sighting in the "from" entity.

[CelineSebe]

Duplicate #8146