Can Hibernate 5.6 and 6.0 share second‑level cache without conflict?

Goal: verify if Hibernate 5.6 and 6.0 can operate together with the second‑level cache enabled without causing version conflicts.

Constraint: the cache must be shared across both versions while preserving data consistency and avoiding initialization failures.

Uncertainty: the exact conditions that render the cache unusable between 5.6 and 6.0 are not documented, leading to potential stale reads and region mismatches.

Questions: Which version pair reliably maintains cache consistency? What configuration adjustments prevent region incompatibility? How does Hibernate 6.0’s unified cache interact with 5.6’s region management?