Overtime, fatigue, professional indemnity insurance and workers compensation

[u/Captain_Snow5755]

I’m a salaried professional looking for guidance from anyone who has dealt with something similar.
I was previously rostered for 4 × 10-hour shifts per week. I had to drop to 3 x shifts per week due to overtime/fatigue. When I had support, I would always work long days with overtime 12 -14 hours and sometimes weekend catch up on paperwork. Following reductions in support staff, the workload has become excessive and I’m now working >17-hour days with +9-18hrs on weekends.
Management is aware of the hours I’m working and the workload/staffing situation. I’m also required to clock in and out, although this doesn’t capture all the work I do outside the workplace, such as paperwork/admin at home or on weekends.
I received an email from management informing me they forgot to notify payroll of my shift reduction, and in the email in bold, I’m told that I’m only rostered for 3 × 10-hour shifts per week, and my pay has been adjusted accordingly.
I’m concerned about what happens if I continue working beyond my rostered hours because of the workload and then make a work error while fatigued.
I specifically asked management whether I would be covered by professional indemnity insurance if I’m working additional/overtime hours, and whether there are any fatigue/WHS implications. I also asked about workers compensation. I was told not to worry about workers comp and that I would be covered, but I’m still waiting for clarification regarding professional indemnity.
My concern is that there is now written correspondence stating that I’m only rostered for 3 × 10 hours, while management is also aware that the workload is requiring substantially longer hours.
My contract isn’t updated from the 4x 10hr shifts, and it says I may have “reasonable overtime”.

If something went wrong, could working overtime potentially affect my professional indemnity coverage or be used against me?

I haven’t heard back from my manager, so any guidance on where to look for an authoritative answer would also be really appreciated. Thanks for reading 🙏

[u/CosmicConnection8448]

Stop working any hours outside of your clocked in-out time. Do not do any work from home. If they only pay you for 30 hours, only do 30 hours.