The same Memgraph release changes thirteen Cypher semantics silently.

size(), substring(), left() and right() count characters not bytes so size('中') is 1 not 3, numbers starting with 0 are octal so 09 is a parse error, a RETURN inside EXISTS{} now affects the answer, single() returns null instead of true when the predicate is null for any element, split('',...) returns [''] not [], and a bare CALL{} subquery no longer leaks outer variables. --metrics-format also defaults to OpenMetrics instead of JSON. Most change results with no error raised. GitHub