To replicate the problem:

1) Create a job with a task. Any task will do, but I used a powershell write-output task as an example: write-output 'A'
2) Change the powershell task to: write-output 'B'
3) Right click task, chose Audit log, chose the row with the change, and click 'Revert to selected'. Nothing happens

Could support test and see if you get the same result?

This sounds like a big enough problem for me that it's the reason I'm not updating yet.

I agree. However i think this has been a bug for a while. You may want to test wirh your current version

It's fine for me on 8.4.1

I'm on 8.4.1 to. It worked when I started application as admin. My bad..

And here I just assumed you were on 8.5.1 without looking. Whoops!

...I didn't have to run as admin though. Odd.