Just installed SP02, first mirror command > same problem of SP01. :-(
Uninstalled and downgraded to 2021 SP00...
Bad experience again.

UPDATE 1: I tried again to install SP02 and making the same mirror  on the same file for the same objects, it didn't fail. GOOD NEW!
I hope it was just a temporary or occasional problem. We will see

UPDATE 2: 1 work hour, 3 crashes for unespected errors...
loss of time, loss of work...
It's not working well as I was hoping after the second installation :-(

UPDATE 3: After other 2 hours, other 3 crashes for very simple operations, like a rotate of few lines in the context of a simple drawing...
No way, it's not possible to work in this way. I think I have to make the downgrade again.

My suggestion for all is to take 2020SP04, without upgrade. DS2021 SP00 looks stable, but has a problem in the display showing of lines thickness and lines style (the second is not solved also in 2021 sp02...).
Fortunately, DS2020 SP04 works very well, I think I will make the next upgrade on 2022 or I will pass to another competitor.