When a halt (HLT) condition occurs in UltraScale+ family SSI devices, the Soft Error Mitigation (SEM) IP does not assert all of the status_* signals HIGH.
The following signals remain LOW:
The issue is that two signals are not driven high as specified.
As a work-around, monitoring the other five status signals for simultaneous assertion will indicate a HLT condition, and it can be reliably detected.
This will be addressed in the next release.