core: Fix crash for marked data source prior value #27567
Merged
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When planning a data source change, the object compatibility verification step should be performed with unmarked values. This value is transient and preserving marks is not necessary, and the object change code is not fully marks-aware.
Fixes #27565
I intend to backport to 0.14, although I expect the cherry pick robot will fail due to changes in this package on the main branch.