A regression in the Delphi 10.4 compiler was identified. Its optimizer wrongly deletes some code, in one very specific part of the framework.
As a result a GPF (Access violation) may be triggered with Delphi 10.4 in release mode - the debug mode (when optimization is disabled) has no problem. Thanks to great user feedback, we were able to circumvent it. But we should better stay in alert, like any mORMot, until Delphi 10.4 officially release a patch.