Caching: Fixes regression of the caching of null representations for missing dictionary items (closes #20336 for 13)#20344

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AndyButland merged 4 commits intov13/devfrom

v13/bugfix/fix-handling-of-null-representation-in-cache

Oct 2, 2025

Commits on Oct 1, 2025

Commits on Oct 2, 2025

Amend tests so they verify that cached null values are also removed
kjac
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