Changing clip speed wiped out my zoom tracking.

I added zoom and tracking keyframes to an animated clip which did exactly what I wanted. I then chopped the middle of that clip to give me 3 seperate clips within the zoom sequence. I then changed the clip speed on the middle one to slow it right down but when I played it the zoom tracking keyframes were deleted and I had a slowmo version of the unzoomed clip. I still had the zoom tracking keyframes visible and functioning on the normal 30FPS clips immediately before and after the malfunctioning clip. Should I have changed the clip speed before I added the zoom tracking or it shouldn't make any difference? I'm running my Resolve16 on a healthy Mac platform with specs all well above the minimum.
Cheers, ScottyT

I know this is an old thread but was wondering if you found a fix? I'm having the same problem in Resolve 17 beta 5.