`v1.31.14+rke2r1` is impacted by [RKE multus bug](https://github.com/rancher/rke2/issues/9374) that should be solved in `v1.31.15+rke2r1` (not released in upstream RKE2 since 1.31 is not supported anymore in upstream). Trigger for this issue is https://github.com/rancher/rke2/pull/9011 (`v1.31.13+rke2r1` is not impacted) as explained [here](https://github.com/rancher/rke2/issues/9313#issue-3669208849). To fix this and also Whereabouts IPAM (with the help of [fix](https://gitlab.com/sylva-projects/sylva-core/-/merge_requests/7225) and [MR](https://gitlab.com/sylva-projects/sylva-core/-/merge_requests/7237#note_3158072966)) for `v1.31.14+rke2r1`, I propose to use `v4.2.311` Multus chart version instead of `v4.2.300`. Cluster values workaround for Sylva 1.6.x using `v1.31.14+rke2r1`: ```yaml units: multus: enabled: true helm_chart_versions: v4.2.300: false v4.2.311: true ```