Track Changes bug in v18 (18.0.0.206)

If you use Track Changes for additions and deletions, then switch previews (final and original), when you switch back to off (to show additions and deletions), the additions do not reappear. 

I did this on three documents. Can someone test it to see if they have the same issue. 

(Doesn’t happen in older versions that I’m aware of, so it must the be new version.)