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Handle corrupted row events by reporting whether the field length could not be determined from metadata or whether the field extends past the row buffer instead of falling out through debug-only assertion paths or ad hoc exits during flashback row conversion. Propagate flashback conversion failures through the normal mysqlbinlog error path so debug builds produce the intended diagnostics cleanly. Add replication tests covering corrupted BLOB metadata and corrupted BLOB length prefixes using server-side debug injection to write broken binlog contents and mysqltest-friendly mysqlbinlog invocation patterns. Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com> Reviewed-by: Georgi Kodinov <joro@mariadb.org>