Comment 1 for bug 1900876

I have this issue on a customer cloud, and presently have had to manually make the change. I can second this as good to have to avoid needing manual steps.

For future travellers, this is how I manually applied the change:

* Run: calicoctl get felixconfig default -o yaml --export > felixconfig.yaml
* Modify felixconfig.yaml, adding "chainInsertMode: Append" within the "spec" dictionary.
* Run: calicoctl replace -f felixconfig.yaml