Nested refs are not properly removed in groupings knowledge graph

[JeremyCloarec]

Description

When trying to delete a ref from a groupings knowledge graph, the ref is deleted at first, but when switching to an other tab and switching back, the ref is still visible

Reproducible Steps

1. Create a new grouping
2. Go to the knowledge graph, add a malware and file observable
3. Create a sample ref between the malware and the file
4. Delete the sample ref
5. Switch to an other tab and come back

Expected Output

The ref being removed from the groupings graph

Actual Output

The ref still visible in the graph

Additional information

No graphql query is sent when removing the ref

[nino-filigran]

Reproduced on Demo