Backport of ignore_changes
converting null maps to empty maps, and applying marks. into v1.1
#29938
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Backport
This PR is auto-generated from #29928 to be assessed for backporting due to the inclusion of the label 1.1-backport.
The below text is copied from the body of the original PR.
When processing nested data structures for
ignore_changes
, a null map was sometimes converted to an empty map.When processing individual changes within a map, those changes could be lost when re-applying any marks set on the outer map.
Fixes #29921