Unknown set blocks with dynamic may have 0 elements#25662
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The couldHaveUnknownBlockPlaceholder helper was added to detect when a set block has a placeholder for an unknown number of values. This worked fine when the number increased from 1, but we were still attempting to validate the unknown placeholder against the empty set when the final count turned out to be 0. Since we can't differentiate the unknown dynamic placeholder value from an actual set value, we have to skip that object's validation altogether.
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The
couldHaveUnknownBlockPlaceholderhelper was added to detect when aset block has a placeholder for an unknown number of values. This works
fine when the number increased from 1, but we were still attempting to
validate the unknown placeholder against the empty set when the final
count turned out to be 0.
Since we can't differentiate the unknown dynamic placeholder value from
an actual unknown number of set values, we have to skip that object's validation
altogether.
Fixes #25600
Fixes #22409 (same case but slightly different cause)