Backport of handle empty containers in ProposedNew NestedTypes into v1.0 #29587
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Backport
This PR is auto-generated from #29580 to be assessed for backporting due to the inclusion of the label 1.0-backport.
The below text is copied from the body of the original PR.
Empty containers of NestedTypes were not handled in ProposedNew, causing plans to be submitted with null values where there was configuration present.
Fixes #29576