SDN with EVPN controller: Routing loop when using multiple exit nodes

Hi all,

currently I am trying to set up a cluster with SDN with an EVPN controller using multiple exit nodes, but I can't get around an issue with a routing loop.
The packets I send are stuck in a loop between both exit nodes and never forwarded outside of the cluster.
Each exit node has a default route to the other exit node, forwarding the packet to the other node instead of sending it outside the cluster.

I confirmed this using tcpdump on both nodes, showing the same packet (sequence...

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