[Charts/Apps] Lists-in-Lists broken on latest build

With the latest nightly (10-03) I get the following error when trying to install or edit charts containing a list inside another list.

Why do I know it's the update and not the chart?
I tested it with our known-good (well, mostly good anyway) master branch, which contains a list-in-list for Ingress.
21.02 is fine and nightly from a few weeks ago too.

Possible PR's related to this:
- App install wizard PR by Alex Karpov  (though it's not limited to the wizard, the wizard changed a lot)