Kubeapps fails to sync AppRepositories on Kubernetes 1.20

Kubeapps fails to sync AppRepositories on Kubernetes 1.20: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I tried installing the latest Kubeapps on a Kubernetes 1.20 cluster (still a supported upstream version) and the apprepository-controller can't get the…

The task

I tried installing the latest Kubeapps on a Kubernetes 1.20 cluster (still a supported upstream version) and the apprepository-controller can't get the bundled `bitnami` repo to sync. New AppRepositories I add through the dashboard show the same problem — they never finish syncing and no charts ever appear.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.