Artifact tags are overwritten by alert sourceRef during import to case

[ninSmith]

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	All OS
OS version (client)	All client
TheHive version / git hash	3.0.9 but most likely apply to all version which supports the alert feature
Package Type	Binary
Browser type & version	N/A

Problem Description

I created an alert with thehive4py 1.5 where sourceRef='foo'.
The alert was created with an artifact which has tags=['bar'].
Then I imported the alert as a case through the web UI.
Now, looking at the observable, tags are only: foo.

I suspect that TheHive overwrite the observable tags with the alert's sourceRef at import.

Steps to Reproduce

1. Create alert with a tagged artifact through thehive4py
2. Import the alert as a case through web UI
3. Check the observable tags

[ninSmith]

Layer 8 problem, please ignore.