On a recent flight into ELLX I had an 'EFIS MISCOMP HDG', with the left rose being approx 15 degrees off when on the LOC. for RWY 06
It is impressive that Hotstart simulates this.
The FCOM 1 advizes the following with this message:
(1) Flight instruments and Integrated Standby Instrument..........................Cross-check
(2) Reversionary panel, IRS switch.......................................... Select to reliable alternate source.
As I was visual I continued the APP so I did not get round to switching to teh reliable source, but I would not be surprise if Hotstart had also this correctly modelled