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Multiple issues in Chai 4.x: assertion flag loss, inconsistent property checking, error message…

Multiple issues in Chai 4.x: assertion flag loss, inconsistent property checking, error message…: a task in LegoFlow-SWE (Harbor dataset). Background Chai 4.x introduced several breaking changes and new features that need to be merged into the main branch. Multiple behavioral issues and missing…

The task

**Background** Chai 4.x introduced several breaking changes and new features that need to be merged into the main branch. Multiple behavioral issues and missing features are present; this issue consolidates the necessary fixes.

Part of Lego-X/LegoFlow-SWE.