v.25.12Bug Fix (user-visible misbehavior in an official stable release)

Fix a serialization

Official CH changelog text
Fix a serialization inconsistency between sparse and nullable substreams in Tuple columns that could lead to corrupted parts or crashes during reading. This addresses https://github.com/ClickHouse/ClickHouse/pull/91851 . @Algunenano Could you please help check if this can fix the stress test in private repo? @CurtizJ Could you also help take a look please? Thanks!. #91932 (Amos Bird).
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