kubectl-eks fails on multiple kubeconfig files

[5nafu]

kubectl allows to use a PATH-style format in your KUBECONFIG environment variable.
kubectl-eks (v0.4.3) then fails to load the configuration as the value is used as one filename:

$ kubectl eks addons
Failed to load kubeconfig: open .kubeconfig:/Users/5nafu/.kube/config:/Users/5nafu/.kube/config.d/01_preferences:/Users/5nafu/.kube/config.d/EKS:/Users/5nafu/.kube/config.d/openshift: no such file or directory
2023/11/01 15:21:38 open .kubeconfig:/Users/5nafu/.kube/config:/Users/5nafu/.kube/config.d/01_preferences:/Users/5nafu/.kube/config.d/EKS:/Users/5nafu/.kube/config.d/openshift: no such file or directory