Error when creating Epics

Hello,

I am trying to create an Epic and then trying to associate issues with that epic. When I create the epic it gives me an error Something went wrong while fetching child epics. The Epic is created but I am unable to associate an issue with the Epic.

Nothing I found seems to resolve the issue, has anybody experienced this and found a solution?

We are a self-hosted GitLab instance version 13.7.3-ee

Thanks
VC